JPH0325759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a watch that greatly contributes to the effective use of daylight hours and can also serve as a pacemaker for daily life, which is rapidly changing these days.

(Prior Art) By specifying a city (geographical location) and a date, the
Islamic clocks and the like have been developed that have the function of displaying times related to sunlight, such as sunrise and sunset times.

However, these conventional clocks are very complicated to operate, and there are also Islamic clocks that memorize the sunrise and sunset time data and display the time related to sunlight by specifying the city and date. Although it is possible to accurately know the sunrise and sunset times in cities where the sunrise and sunset time data is stored, accuracy is lacking in geographical locations other than the memorized city, and The amount of data needed increases in proportion to the number of cities stored, resulting in a huge amount of data.Also, it was only possible to display sunlight-related times for the standard time currently in use, so daylight saving time was used. Also, in countries like the United States that have multiple standard times, or in cases where the standard times are different even though they are located relatively close to each other, it is difficult to monitor the sunlight conditions in cities that belong to other standard times. When you want to know the information, apart from specifying the city, there was an inconvenience that the displayed time related to sunlight would be meaningless unless you corrected the standard time. This is because the time related to sunlight is a function of the date, the latitude and longitude of the required city and geographical location, and the longitude of the standard meridian. Therefore, it has been considered to be extremely difficult in practice to approximate the amount of sunlight in a designated city so that it can be easily calculated.

(Objective of the Invention) The present invention was made in view of the above circumstances, and its purpose is to determine the time related to sunlight based on the declination and equation of time as coefficients of the astronomical position of the sun according to the date, and the geographical Based on the position that the calculation is based on the latitude and longitude of the location and the longitude of the standard meridian, it is possible to calculate and process these coefficients rationally and effectively to know the time related to sunlight, and it is easy to operate. We provide a clock that has the function of a world clock and can be used as a pacemaker in daily life in an increasingly complex and diverse society that allows you to know the state of sunlight in cities around the world in real time. It's about doing.

(Structure of the Invention) In order to achieve the above object, the present invention has the following structure.

In other words, an input section into which the latitude and longitude specific to a specified point is input, a memory circuit which outputs the standard meridian of the specified point, and a circuit which outputs the equation of time and declination based on the signals output from the autocalendar. a sunrise/sunset time calculation unit that outputs a sunrise time and sunset time specific to the designated point using numerical values obtained based on the outputs of the input unit, the storage circuit, and the circuit unit; and a display circuit unit that receives a signal from the sunrise/sunset time calculation unit and displays the signal.
This is a watch that is characterized by:

The invention will now be explained in detail with reference to illustrated embodiments.

First, the main functions of one embodiment of the present invention will be described as follows.

B. Time (hours: minutes, seconds) display function.

B Date (year, month, day) and day of the week display function.

C. A function that has a function of storing a city, a method and function of specifying the city, and a function of calling the meridian data signal, longitude data signal, and latitude data signal of the specified city.

D. A function to call the equation of time data signal and declination data signal according to the date on the auto calendar.

(e) A function that calculates and displays the sun's meridian passage time for a specified city using the meridian data signal, longitude data signal, and equation of time data signal among the data retrieved based on the specified city and date.

F. A function that calculates the required hour angle from the latitude data signal and declination data signal among the data retrieved based on the specified city and corresponding date.

G. A function that calculates and displays the required times of sunrise and sunset, dawn and dusk, etc., using the calculated hour angle data.

H. When changing from a city belonging to one standard time zone to a city belonging to another standard time zone, depending on the respective meridian data, date and time signals,
A function to correct and display the changed city date and time.

Next, the structure of the wristwatch 1 that performs the above functions will be described. 2 is the main body, and 3 is a display panel.

The main body 2 has four rotary operation buttons 4,
5, 6, and 7 are provided. First, the operation button 4 is commonly called an adjust button, and when it is in the off state without being pressed even once, the display panel 3
The top is the normal time display state, and the time display is
It is possible to switch between 12-hour and 24-hour display, and when it is pressed once and turned on, the display contents on the display panel 3 can be changed so that the data necessary for each calculation function can be entered. It is intended to be in a state of

The operation button 5 is used to change the mode when changing the display contents on the display panel 3. Basically, when the button is pressed 0 times, it changes the time, date, or day of the week, and when it is pressed once, it changes the time, date, or day of the week. Enter the city number, 2 times, 3 times,
For the 4th and 5th time, the northern latitude, southern latitude, and
It is possible to input the west longitude and east longitude, and when it is 6 times, to set daylight saving time and slow time. Note that after inputting the northern latitude of a point, inputting the southern latitude is disabled, and the next (third) press operation switches to west longitude input mode, and the next (fourth) press operation switches to east longitude input mode, and then input west longitude. After that, it is impossible to enter the east longitude (4 or 5 times)
In the second pressing operation, the setting mode for summer time and slow time is set. In other words, data is not entered twice.

The operation button 6 is used to specify a more detailed mode than the mode specified with the operation button 5.
That is, when the specified mode in the operation button 5 is the time, date, or day of the week change mode, if the operation button 6 is pressed 0 times, the "second" part of the time (hour: minute, second), 1 The hour part is shown twice, the tens digit part of the minute is shown three times, the one digit part of the minute is shown three times, the day of the week is shown four times, and the date (month, day) is shown five times. "Moon" part,
The "day" part can be changed every six times. When the designation mode of the operation button 5 is the city number designation mode, a state is created in which the tens digit can be changed with zero presses of the operation button 6, and the ones digit can be changed with one press. There is. When the specified input mode of the operation button 5 is the specified input mode of points (degrees [°], minutes), the pressing operation of the operation button 6 is 0.
The tens and hundreds digits of "degrees" are expressed once, and "degrees" are expressed once.
1's digit part of "minute" twice, 10's digit part of "minute" twice,
After three times, the 1's digit part of the minute can be entered. And finally,
When the specified mode in operation button 5 is the summer time and slow time specified mode, press operation button 6 0 to 5 times to increase +30 to +180 in 30 minute increments.
Settings from -30 to -180 are made in 30 minute increments in 6 to 11 times, which means daylight saving time (advancing time) from a minimum of 30 minutes to a maximum of 3 hours.
It is also possible to set slow time (delaying time).

The operation button 7 is used to switch the time display between the 12-hour display and the 24-hour display when the operation button 1 is off, that is, when the display panel 3 is in the normal timekeeping state. This is for setting the numerical value or character (alphabet for the day of the week) of the specified mode by operating operation buttons 5 and 6 when the button is on.Excluding special cases, each press operation The numerical value is added in increments of 1 up to the upper limit value of each mode, and when the upper limit value is reached, the value returns to 0 when the button is further pressed. Here, the special case is "seconds" of time.
Regarding the "seconds" part of the time, the display changes to "00" with a single press of button 7, and in the case of the day of the week, each press of button changes the display from Sunday to Saturday. Alphabets up to this point are displayed in sequence. Incidentally, since all settings for daylight saving time and slow time are performed using operation button 6, operation button 7 has no relation to the operation for setting daylight saving time and slow time.

By the way, the display panel 3 includes a first digital display section 8, a second digital display section 9, a third digital display section 10, a day of the week display section 11, a first mode display section 12, and a third mode display section 13. It is arranged as follows.

The first digital display section 8 displays the input data when setting time point data in the timekeeping state, and also displays the input data on the analog display band, which will be described later, depending on whether "ON" is displayed or not. It is designed to indicate whether the mid-day time, sunshine hours, and non-sunshine hours are based on city number designation or point designation. Furthermore, the presence or absence of "+" and "-" indicates that summer time (+) is designated, slow time (-) is designated, or that these are not designated.
The second digital display section 9 displays the date, and the third digital display section 10 displays the city number.

The first mode display section 12 displays which mode data is being input when changing the display contents. Here, when changing the time, date, or day of the week, the "TIME" part is displayed. The ``CITY'' part lights up when you enter a city number, the ``POINT'' part lights up when you specify a point, and the ``SUM'' part lights up when you set summer time or slow time. The second mode display unit 13 indicates whether the time is displayed in the timekeeping state, 12 hours or 24 hours. This is indicated by the display ``N'', ``S'', ``W'', or ``E'' to indicate whether the point data is being entered in terms of northern latitude, southern latitude, western longitude, or eastern longitude. It is considered a thing.

A time display scale 14 is further provided on the display panel 3 along its outer edge, and an analog display band 15 is provided outside of the time display scale 14 along this. . This analog display band 15 is for displaying the approximate mid-day time, sunshine hours, and non-sunshine hours in an analog or graphical manner, and is made of colors or materials that can realize multiple optical states, such as liquid crystal. Therefore, it is constructed as follows. In addition, this analog display band 15 is divided into 10-minute increments in accordance with the time display scale 14, and has a dual structure inside and outside, with the outer one being the AM display band, which is the AM display band. The PM display section 15A is the PM display section 15A, and the inner side is the PM display section 15P, which is the afternoon display band.
With this configuration, as shown in the figure, different optical states are expressed in accordance with the time display scale 14 during sunshine and non-sunshine times.

Next, the configuration of an internal circuit related to the display function of midsummer time, sunshine time, and non-sunshine time will be explained.

In FIG. 2, the circuit is first roughly divided into a midsummer time calculation section 16, a sunrise/sunset time calculation section 17, and a display circuit section 18.

The meridian time calculation section 16 has a meridian data storage circuit 19 , a longitude data storage circuit 20 , an equation of time data storage circuit 21 , and a meridian time calculation circuit 22 . The meridian data storage circuit 19 stores standard time meridian data of each classification, receives a city number data signal, and outputs a meridian data signal of the classification to which the city belongs. The longitude data storage circuit 20 stores longitude data necessary for calculating the central time and time difference angle based on the city number designation determined for each registered city.
It receives a city number data signal and outputs the longitude data of that city. The equation of time data storage circuit 21 stores equation of time data for each date, receives a date data signal, and outputs an equation of time data signal for that date.

The meridian time calculation circuit 22 includes a meridian data signal from the meridian data storage circuit 19, a longitude data signal from the longitude data storage circuit 20, an equation of time data signal from the equation of time data storage circuit 21, and a data setting circuit group (not shown). The longitude data signal, daylight saving time, and slow time data signal from Become something.

That is, (Central time) = (longitude data of city number) - (meridian data of standard time zone) + (equation of time) + (12 hours) + (summer time or slow time)...

The midsummer time calculation circuit 22 outputs the calculation value data signal obtained by the above formula to the display circuit section 18 and the sunrise/sunset time calculation circuit section 17.

The sunrise/sunset time calculation section 17 includes a latitude data storage circuit 23, a declination data storage circuit 24, an hour angle calculation circuit 25, and a sunrise/sunset time calculation circuit 2.
6. The latitude data storage circuit 23 is
It stores the latitude data necessary to calculate the hour angle based on the city number specified for each registered city, receives the city number data signal, and outputs the latitude data signal for that city. It is assumed that The declination data storage circuit 24 stores declination data corresponding to the date, and outputs a declination data signal in response to a date data signal.

The hour angle calculation circuit 25 receives a latitude data signal from the latitude data storage circuit 23, a declination data signal from the declination data storage circuit 24, and a latitude data signal from a data setting circuit (not shown), and converts these signals into It calculates the hour angle based on this and outputs the signal, and the calculation formula is as follows.

In other words, to=cos(−tanφ・tanδ)…or costo′=−(sinθ+sinφ・sinδ)secφ・secδ…
It is.

The formula is for when the center of the sun is above the horizon, where to is the hour angle, φ is the latitude, and δ is the declination.

The formula takes the time when the sun begins to be visible on the earth as sunrise, and the time when it finishes setting below the earth's surface as sunset. In this formula, to' is the hour angle, φ is the latitude, and δ is the declination. be. And θ is a coefficient, and the apparent radius of the sun is considered to be about 50', considering the influence of atmospheric refraction near the 16' horizon to be about 34'.

The sunrise/sunset time calculation circuit 26 receives the calculated value data signals from the midsummer time calculation circuit 22 and the hour angle calculation circuit 25, calculates the sunrise time and sunset time based on these signals, and calculates the calculated value. It is supposed to output a data signal, and its formula is as follows.

That is, (Sunrise time) = (Southern Central time) - to, ... (Sunset time) = (Southern Central time) + to, … It is.

Furthermore, the configuration of an internal circuit related to calculation and display functions of time difference and date of meridian data of different classifications will be explained.

In FIG. 3, the circuit first includes a meridian data storage circuit 19 similar to that of the meridian time calculation section 16 described above, a time difference/date calculation circuit 27, a clock/auto calendar section 28, and Display circuit section 18
It is broadly divided into.

The meridian data storage circuit 19 receives the instruction signal 29 of the first designated city number or the already designated city number, and the instruction signal 30 of the newly designated city number, and stores the stored standard time meridian data. The meridian data signals corresponding to the instruction signals 29 and 30 are sent to the time difference angle/date calculation circuit 27.
This is what is output to.

The time difference/date calculation circuit 27 receives a signal from the clock/autocalendar unit 28 and one or two different meridian data signals from the meridian data storage circuit 19, and calculates the time difference or date based on these signals. It calculates and outputs the signal, and the calculation formula is as follows.

In other words, (time t1 of the first or newly specified city) = (meridian data of the first specified city number or specified city number) - (meridian data of the newly specified city number) + (clock/ (time signal from the auto-calendar section 28), . . . If time t1 is within the range of 0≦t1<24, there is no need to correct the date, but if time t1 is less than 0, the date indicates the previous day, and the time associated with the correction of the date Make corrections. That is, t1+24=t1', ..., where t1' is the time correction value. Further, if the time t1 is 24 or more, the date indicates the next day, and the time is corrected in accordance with the correction of the date.
That is, t1−24=t1″, ..., where t1″ is the time correction value.

The timepiece autocalendar unit 28 receives the calculated value data signal from the time difference angle/date calculation circuit 27, corrects the time/date data, and outputs the corrected time/date data to the display circuit unit 18.

The handling of each data in the above formula is as follows.

Hour angle: The hour angle when the sun goes south (at noon or when it passes through the meridian) is 0 (zero), and the hour angle toward the afternoon (west) is positive.

Declination: The equator of the celestial sphere is defined as 0 (zero), and the distance measured from this point toward the north pole is defined as positive.

Equation of time: Positive when the actual sun is further west than the average sun.

Point: East longitude is negative, west longitude is positive, north latitude is positive, and south latitude is negative.

- The display circuit unit 18 receives the calculated value data signals from the midsummer time calculation circuit 22 and the sunrise/sunset time calculation circuit 26, and based on these data, displays the midsummer time, It displays sunshine hours and non-sunshine hours.

Next, an operation method for displaying midsummer time, sunshine time, and non-sunshine time using the wristwatch 1 having the above configuration and its operation will be explained using a specific example.

(1) When specifying a city number Here, we will explain the case where the date is September 21st, the first city specified is Tokyo, and the city number is "12" (however, no daylight saving time is specified). It is assumed that the time, date, and day of the week settings have been completed.

First, it is assumed that the operation button 4 has been pressed once and the timekeeping state has stopped, and that the display state as shown in FIG. 1B is reached when the time setting is completed.

Therefore, when the operation button 5 is pressed once, the first digital display section 8 as shown in FIG.
The displays on the second digital display section 9, the day of the week display section 11, and the second mode display section 13 disappear and become blank, the display on the first mode display section 12 changes from "TIME" to "CITY", and the display on the third mode display section 12 changes from "TIME" to "CITY".
The ten's digit of the digital display unit 10 blinks, etc., and the numerical value of the ten's digit of the city number can be entered. When the operation button 7 is pressed once, "1" is displayed in the tens digit of the third digital display section 10, and the input of that digit is completed.
Next, when the operation button 6 is pressed once, the first digit of the third digital display section 10 flashes, etc., and the numerical value of the first digit of the city number can be entered. Therefore, by pressing the operation button 7 once and twice, the one digit display on the third digital display section 10 changes to "1" and "2", and the input of that digit is completed, and the display panel The display on 3 becomes as shown in FIG. 1D, and the designation of the city number is completed.

Next, when the operating button 4 that is in the on state is pressed once to turn it off, the timekeeping state is restored. At the same time, calculations are performed in the internal circuit, and an example of the calculation is as follows.

First of all, Tokyo belongs to the Akashi Standard Time meridian classification,
The meridian data is "-135°", its longitude is "-139°46", and the equation of time on September 21st is "-6 minutes 35 seconds", so the deviation from noon at the center of gravity is is (-139゜46''+195゜) - (-135゜+195゜) + (-6 minutes 35 seconds) + (12 hours) = (41゜14") - (45゜) + (-6 minutes 35 seconds) = (-4゜46'') - (6 minutes 35 seconds) = (-19 minutes 4 seconds) - (6 minutes 35 seconds) = -25 minutes 39 seconds, and the South Central time is (12:00 00 seconds) + (-25 minutes 39 seconds) = 11:34 minutes 21 seconds.

Also, the latitude of Tokyo is "+35°41" and the declination of September 21st is "+1°01", so the hour angle is cos (-tan35°41"・tan1°01") = 90.73゜ = 6 hours 2 minutes 55 seconds, and the sunrise time is (11:34:21) - (6 hours 2 minutes 55 seconds) = 5:31:26, and the sunset time is (11:34:21) ) + (6 hours 2 minutes 55 seconds) = 17:37 minutes 16 seconds.

The analog display band 15 is controlled by the display control circuit section 18 based on the calculated value data from the above calculation, and the analog display band 15 controls the first
This is displayed as shown in Figure E. Here, the filled-in areas are sunshine hours, and the other areas are non-sunshine hours. In addition, the South Central time (shaded area in the figure) is displayed by blinking. By looking at this display, you can also check the approximate sunrise and sunset times. You can also see the remaining daylight hours at a glance.

(2) Case by specifying points Here we will only explain the differences from case (1), but the point data is based on the latitude and
The standard meridian data using longitude is stipulated by that of Tokyo.

First, when the operation button 5 is pressed once and twice with the time setting already completed and the operation button 4 turned on, the second digital display section 9 and the day of the week display section 11 are displayed. It disappears and becomes blank, and "PM" on the second mode display section 13,
The display of "24" disappears and the display on the first mode display section 12 shifts from "TIME" to "CITY" to "POINT", and "N" appears on the second mode display section 13.
is displayed, and the tens digit of the first digital display section 8 blinks, and the numerical value of the tens digit of "degrees" of the north latitude data can be entered. Therefore,
When the operation button 7 is pressed three times, "∃" is displayed in the tens digit of the first digital display section 8. Next, the operation button 6 and the operation button 7 are operated again in this order, and when the input of numerical values of all digits is completed, the display state as shown in FIG. 1G is obtained.

Next, when the operation button 5 is pressed once, "W" is displayed on the second mode display section 13, skipping "S", and when it is pressed once more, "E" is displayed, and the first digital display section The hundreds digit of 8 flashes, and the hundreds digit of "degrees" of west longitude can be entered. Therefore,
When the operation button 7 is pressed once, the first digital display section 8
"1" is displayed in the hundreds digit. Next, as in the case of northern latitude, operate operation buttons 6 and 7 in that order, and when all digits have been entered, the first
The display state is as shown in Figure H.

Then, the operation button 4 that is in the on state
When pressed once to turn it off, the timer returns to the timekeeping state, and the same calculations as in (1) are performed, resulting in a display state as shown in FIG. 1I.
Note that the meridian data at this time is based on the specified city number mentioned above.

That is, even by specifying points, it is possible to display the time of day and daylight hours, which is effective because it is possible to check areas for which cities cannot be specified or details by area.

Fig. 4 shows another embodiment of the present invention, which is applied to an analog pointer type wristwatch indicated by 1', which is dedicated to specifying a city number, 2' is its main body, and 3 ' is a display panel, and 31 is a time display scale.

Inside the time display scale 31 of the display panel 3, a first digital display section 32 for displaying the date, a second digital display section 33 for displaying the city number, and a day of the week display section 34 for displaying the day of the week are provided. . Further, an analog display band 35 is provided outside the time display scale 31, and this analog display band 3
5 is divided into 10-minute increments, and has a double structure inside and outside, with the outer one being the AM display section 35A, which is the morning display zone, and the inner one being the afternoon display zone. PM display section 35P
It is said that As shown in the figure, different optical states are expressed along the time display scale 31 during sunshine and non-sunshine times.

According to this embodiment, the hour hand and the analog display band 3
By looking at 5 and 5 together, you can check the remaining daylight hours even more quickly.

Furthermore, it is also possible to divide the analog display band 35 into four parts each having a 90° angle, each of which can be configured to designate points of northern latitude, southern latitude, west longitude, and east longitude, thereby adding a display function based on point designation. In this case, according to this example, if you convert it into 10 minute increments, that is, in degrees,
It is advantageous to have it in 5° increments.

Although the present invention has been described above with reference to the embodiments, it is not limited thereto and includes the following.

(A) In the embodiment, the display part is ring-shaped, but it is not limited to this shape, and may be bar-shaped.

(B) In the ring-shaped display section of the above embodiment, 360° is divided into 12 sections, and each section is further divided into 6 sections, but the invention is not limited to this. .

(C) Also, if you separately provide a bar graph that displays the sunshine hours themselves and change the display as time passes, you can display the remaining sunshine hours at that time. , which is especially useful when you're traveling with the watch.

(D) Both examples are focused on portable wristwatches, but they are not limited to portable wristwatches, and can also be applied to table clocks, table clocks,
Of course, it can also be applied to things such as wall clocks.

(E) It is also possible to numerically display data such as equation of time data, declination data, and meridian data.

(F) The center of the sun is at an angle of inclination to the horizon (7°1′40″)
It is also possible to display the time of dawn and dusk by calculating the time of day. That is,
All you have to do is substitute the value of this inclination angle for θ in the equation.

(G) It is also possible to numerically display sunrise, sunset, dawn, dusk, etc., and it is also easily possible to emit an alarm sound at times related to the required sunlight.

(H) Furthermore, when using the clock of the present invention, it is of course convenient to use a common city number for longitude, latitude, and meridian data; It is effective to have a table of numbers corresponding to the numbers, or a map showing the location of cities in relation to the numbers. This table or map may be written on the back of the watch, on the band, etc., or written on a printed matter for the watch, a special card, etc.

(I) Furthermore, as a means of specifying a city, in addition to the city number, an alphabet, a symbol, or the city name itself may be used, and various modes are conceivable.

(J) In this embodiment, four buttons are used to specify the time, date, daylight saving time, slow time, time display, city, point, or geographic location, or input data to retrieve the required information. Although the functions have been explained using examples, for example, as shown in the block diagrams shown in FIG. 7 and FIG. It goes without saying that it is possible to add various input methods by providing the input section 36 with
Incidentally, to explain the function of the input section 36 using an example, the rotary switch 37 and city button in FIG. Key matrix 38 in Figure 6 for specifying numbers and geographical locations, numerical values for daylight saving time and slow time, specifying mode changes for degrees and longitudes, and specifying mode changes for degrees, minutes, days of the week, months, and days. By making it possible to easily input the required information using the count button 39, it is possible to develop a watch that is even easier to use.
In step 6, voice recognition or graphic/
It is easy to imagine solar clocks with various input methods, such as using a character reading device or a touch panel.

(K) Also, it can easily become an Islamic clock by adding a function to calculate the times of five prayers a day based on the sunrise and sunset times of the day as follows.

1st time (Hwajiyul) = Sunrise time - A (1 hour≦A≦2 hours) 2nd time (zuhr) = (sunrise time + sunset time)/2 3rd time (Azul) = (2nd time +Sunset time)/2 Or (second time + B) (B=3 hours).

4th time (Maghrib) = sunset time 5th time (Isiyaw) = sunset time + C (C = 1 hour 30 minutes), and similarly, the required time based on the time related to sunlight, for example, 1 hour before sunset. It is also possible to set it like this.

(L) In the embodiment of the present invention, the equation of time data and declination data are called with a part that stores the equation of time and declination as coefficients necessary to specify the astronomical position of the sun corresponding to the date. However, even if the equation of time data and declination data necessary to specify the astronomical position of the sun corresponding to a date are obtained by a well-known calculation method, it is difficult to calculate the time related to sunlight, which is the intention of the present invention. The display functions, their effects, how to use them, etc. will not change at all.

(Effects of the Invention) As is clear from the above, according to the present invention, the time related to daylight hours depends on the sun's declination and equation of time depending on the date, the local latitude and longitude, and the longitude of the standard meridian. It is calculated accordingly.
In the present invention, the time related to sunlight is calculated rationally and effectively, and at the same time, these data are utilized to the fullest, and the operations normally required to know the time related to sunlight are those of a normal clock. Just specify the city or geographical location in the usage method,
At the very least, it is something that allows you to know the time of sunrise and sunset, and the time of the sun's meridian passage (Central time), and for example, if you are in Tokyo and want to know the local date, time, and sunlight in New York. In some cases, simply specifying New York will do the trick. Further, the time related to sunlight obtained by the present invention is accurate and has extremely high practicality, and its industrial application range is extremely wide.

[Brief explanation of drawings]

1A to 1I are plan views showing the display structure of the timepiece of the present invention, and FIG. 2 is a block diaphragm showing the configuration of the internal circuit related to the display function of the mid-day time, sunshine time, and non-sunshine time. FIG. 3 is a block diagram showing the configuration of an internal circuit related to calculation and display functions of time difference and date of meridian data of different classifications, FIG. 4 is a plan view showing the display structure of another embodiment of the present invention, and FIG. The figure and Figure 6 are rotary switch 37, key matrix 38, and count button 3, which have the same functions as operation buttons 4, 5, 6, and 7.
9. FIGS. 7 and 8 are block diagrams showing the structure of an internal circuit of a watch having an input section with the same functions as the operation buttons 4, 5, 6, and 7. 1, 1... Wristwatch, 24, 26... Time display scale, 16... Southern time calculation unit, 17... Sunrise.
Sunset time calculation section, 15, 31...analog display band (display section).

Claims (1)

[Claims] 1. An input section into which latitude and longitude specific to a specified point are input, a memory circuit which outputs the standard meridian of the specified point, and an equation of time and declination based on a signal output from an autocalendar. a circuit section that outputs a sunrise time and a sunset time specific to the specified point based on the values obtained based on the outputs of the input section, the memory circuit, and the circuit section;
A timepiece comprising: a sunset time calculation section; and a display circuit section that receives and displays signals from the sunrise and sunset time calculation sections.