JPH0418278B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sunrise/sunset time display device that greatly contributes to the effective use of daylight hours and can serve as a pacemaker for today's rapidly changing daily life. It is.

(Prior art) In recent years, the world has become more and more complex, and as a result of this complexity, people are leading rapidly changing daily lives. Particularly in outdoor exercise, home gardening, do-it-yourself construction, etc., it becomes necessary to take into account daytime and nighttime hours, that is, daylight hours and non-sunshine hours.

By the way, when you go far away, especially overseas, the sunshine hours and non-sunshine hours of the place where you go and your daily life often do not match. It also becomes necessary to know the non-sunshine hours. On the other hand, if you decide to take action based on a schedule that you have set without taking into account the geographical conditions of your destination, there will be a discrepancy between your self-perception and reality, leading to confusion.

Heretofore, various clocks have been developed that have the function of displaying the sunrise and sunset times for a city (geographical location) and date by inputting and specifying the city (geographical location) and date. By using this, you can know the sunshine hours and non-sunshine hours,
This is effective when planning schedules.

However, this conventional clock is very complicated to operate, and although there are Islamic clocks that memorize and display the sunrise and sunset times in cities, these clocks do not accurately display the sunrise and sunset times in cities that have memorized the sunrise and sunset time data. It is possible to know the sunset time, but for geographical locations other than the memorized cities, it lacks accuracy because it uses data from nearby cities, and the data to be memorized varies depending on the number of cities. As the number of standard times increases, it becomes enormous, and in countries such as the United States that have multiple standard times, daylight saving time, slow time, etc.
In cases where the locations are relatively close to each other but the standard time is different, there is an inconvenience in that the displayed sunrise and sunset times are meaningless unless the standard time is corrected. There was no way to calculate and display the times of dawn and dusk.

(Object of the invention) The present invention is a divisional application of patent application No. 60-30078, which is a divisional application of patent application No. 58-216754, and was made in view of the above circumstances. The application has been filed in combination with a clock, but this application is based on the date, latitude and longitude of the required city and geographical location, longitude of the standard meridian, declination, and equation of time. To provide a device that calculates not only the times of sunrise and sunset, but also the times of dawn and dusk, without increasing the circuit configuration, by a function of calculating the time when the center of the sun passes a specific altitude using a coefficient specifying the height and altitude. It is in.

(Configuration of the Invention) To achieve the above object, the present invention has the following configuration.

That is, a date data output means for outputting date data, an equation of time data output means for outputting equation of time data corresponding to the date, a declination data output means for outputting declination data corresponding to the date, a standard meridian data output means for outputting standard meridian data; an input section into which latitude and longitude specific to a point are input; An hour angle calculation circuit that outputs an hour angle based on coefficients specifying the declination, latitude, and altitude, and a signal that calculates a time related to sunlight based on the south meridian time and hour angle. This is a device for outputting time related to sunshine, characterized by comprising an output means for outputting.

(Example) Hereinafter, the present invention will be described in detail with reference to illustrated examples.

In FIG. 1, 1 is a sunshine time and non-sunshine time display device combined with a digital numerical display type portable wristwatch according to the present invention. First, its main functions are described as follows (a). It will be as described in ~(h).

(b) A function that has means for specifying a city number and calls the corresponding standard meridian data signal, longitude data signal, and latitude data signal based on the city number.

(b) A function to input the latitude and longitude specific to a point.

(c) Output means for outputting an equation of time data signal and a declination data signal based on the date data signal.

(d) A function that calculates the time when the sun passes through the meridian of a specified point using the equation of time data signal, standard meridian data signal, and longitude data signal. (e) Specifies the latitude data signal, declination data signal, and altitude. A function to calculate the required hour angle by specifying the altitude using the coefficient.

(f) A function that calculates the required times of daylight, such as sunrise and sunset times and dawn and dusk, based on the calculated hour angle.

(g) When changing from a city belonging to one standard meridian to a city belonging to another standard meridian, the world clock function ( h) A function that displays times related to sunlight and times other than those related to sunlight in different optical conditions.

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 is in the normal timekeeping state, and the time display is 12 hours. And it is possible to switch between 24-hour display,
When pressed once and turned on, data necessary for each calculation function can be inputted, and the display contents on the display panel 3 can be changed.

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, the time, date, and day of the week are changed, and when it is pressed once, it is used to change the mode. Enter 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 to set daylight saving time and slow time when it is 6 times. Note that after inputting the northern latitude of a point, inputting the southern latitude is disabled, and the next (third) pressing operation switches to west longitude input mode, and the next (fourth) pressing operation switches to east longitude input mode, and then inputs west longitude. After that, it is impossible to enter the east longitude, and the next time (4th or 5th time)
When the button is pressed, the daylight saving time and slow time setting mode is activated. That is,
Duplicate data entry is avoided.

The operation button 6 is used to specify a more detailed mode than the mode specified using the operation button 5. That is, when the specified mode in the operation button 5 is the time, date, and day of the week change mode, when the operation button 6 is pressed 0 times, the "second" part of the time (hour: minute, second) is pressed, and when the operation button 6 is pressed twice, the "second" part is changed. The tens digit part of "minute", 3
You can now change the 1's digit part of the minute with the 4th time, the day of the week with the 4th time, the month part of the date (month, day) with the 5th time, and the day of the month with the 6th time. ing. When the designation mode of the operation button 5 is a 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. When the designation mode of the operation button 5 is the designation input mode of points (degrees [°], minutes), pressing the operation button 6 0 times will input the tens and hundreds digits of "degrees", and once the operation button 6 is pressed the tens and hundreds digits will be input. The ones digit part of the degree, the tens digit part of the minute twice, and the minute part three times.
The one's digit part is made ready for input. And finally, when the specified mode in operation button 5 is the specified mode for summer time and slow time, press operation button 6 is +30 to +180 in 30 minute increments for 0 to 5 times, and +30 to +180 for 6 to 11 times.
Settings are made from -30 to -180 in 30 minute increments, meaning daylight saving time (advance the time) and slow time (delay the time) can be set from a minimum of 30 minutes to a maximum of 3 hours. It is said that

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 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 in the on state. The numerical value is added in increments of 1 up to the upper limit value, and when the upper limit value is reached, if the pressing operation is further performed, the value returns to 0. Here, the special case refers to the "seconds" part of the time and the day of the week. First, in the case of the "seconds" part of the time, a single operation of operation button 7 changes the display to "00". , in the case of days of the week, alphabets from Sunday to Saturday are displayed sequentially for each pressing operation. 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, and a first mode display section 1.
2 and a third mode display section 13 are arranged as shown in the figure.

The first digital display section 8 displays the time when in the timekeeping state and the input data when setting point data, and is also displayed in an analog display band to be described later depending on whether "ON" is displayed or not. It is designed to indicate whether the central time, sunshine hours, and non-sunshine hours are based on city number designation or point designation. Furthermore, the presence or absence of "+" and "-" indicates the presence or absence of summer time (+) designation, slow time (-) designation, or the absence of these designations. 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, as "PM" (12 hours display, no display in the morning) or "24H". "N", "S", "W", or "E" indicates whether you are inputting point data for northern latitude, southern latitude, western longitude, or east longitude.
It is said to be shown by.

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 on the outside of the time display scale 14 in a corresponding manner. ing. This analog display band 15 is for displaying the mid-day time, sunshine hours, and non-sunshine hours in an analog or graphical manner, using colors or materials that can realize multiple optical states, such as liquid crystal. It is composed of In addition, this analog display band 15 is divided into 10-minute increments according to 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, the time display scale 14
It is said that different optical conditions are expressed in sunshine hours and non-sunshine hours.

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 for each classification, receives a city number data signal, and outputs a meridian data signal according to the classification to which the city belongs and if necessary. The longitude data storage circuit 20 stores the longitude data necessary for calculating the time difference and the time difference based on the city number designation determined for each registered city, and stores the longitude data necessary for calculating the time difference and the time difference based on the city number designation determined for each registered city. It is assumed that the longitude data signal of the city is received and output, and the longitude data from an input section (not shown) is stored and output. 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). Longitude data signals (daylight saving time, slow time data signals) from Become something.

In other words, (Central time) = (meridian data of city number + 180°)
- (Standard time zone meridian data + 180°) +
(equation of time) + (12 hours) + (daylight saving time or slow time), ...(1).

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 has 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 26 . Latitude data storage circuit 23
stores the latitude data necessary to calculate the hour angle based on the city number specified for each registered city, and receives the city number data signal and calculates the latitude data signal of that city. It also stores and outputs latitude data from an input section (not shown). 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 performs calculations based on these signals. It calculates the hour angle and outputs the signal, and the calculation formula is as follows.

That is, to=COS ^-1 (−tanφ・tanδ), …(2) or cos to′=−(sin θ+sinφ・sinδ) secφ・secδ …(3).

Equation (2) is for when the center of the sun is above the horizon; in this equation, to is the hour angle, φ is the latitude, and δ is the declination.

Equation (3) takes the time when the sun begins to be visible on the ground as sunrise, and the time when it finishes setting below the horizon as sunset. In this equation, to is the hour angle, φ is the latitude, and δ is the redness. It is latitude. And θ is a coefficient that specifies the altitude, assuming that the apparent radius of the sun is 16' and the influence of atmospheric refraction near the horizon is about 34'.
It is considered to be about 50′.

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.

i.e. (Sunrise time) = (Southern Central time) − to, ...(4) (Sunset time) = (Southern Central time) + to, ...(5) 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 section 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 designated city number or designated city number) - (meridian data of the newly designated city number) + (time signal from the clock/autocalendar unit 28), ...(6 ).

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 will change due to the date correction. Make corrections.

That is, t1+24=t1′, ...(7), 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″, ...(8), 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.

In addition, the above (1), (2), (3), (4), (5), (6), (7), (8)
The handling of each data in the 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 when it turns in 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 section 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, sunshine hours, and It displays non-sunshine hours.

Next, the operating method and operation for displaying the midsummer time, sunshine hours, and non-sunshine hours using the wristwatch 1 having the above configuration will be specifically explained.

(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 when the time setting is completed, the display state is as shown in FIG. 1B.

Therefore, when the operation button 5 is pressed once, the first
As shown in Figure C, the first digital display section 8, the second
The displays on the digital display section 9, day of the week display section 11, and 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 third digital display section 12 changes from "TIME" to "CITY". The tens digit of section 10 lights up, and the numerical value of the tens 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, press the operation button 4 that is in the ON state to 1.
When pressed twice to turn it off, it returns to the timekeeping state. 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 classification, its meridian data is "-135°", its longitude is "-139°46", and the equation of time on September 21st is "-6 minutes 35 seconds". , The deviation from noon of the meridian time is (-139°46" + 180°) - (135° + 180°) + (-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, The time is (12:00:00) + (-25:39) = 11:34:21.

Also, the latitude of Tokyo is "+35°41" and the declination of September 21st is "+1°01", so the hour angle is cos ^-1 (-tan35°41"・tan1°01") = 90°73″ = 6 hours 2 minutes 55 seconds, and the sunrise time is (11:34 minutes 21 seconds) – (6 hours 2 minutes 55 seconds) = 5:31 minutes 26 seconds, and the sunset time is (11 34 minutes 21 seconds) + (6 hours 2 minutes 55 seconds) = 17:37 minutes 16 seconds.

The analog display band 15 is controlled by the display control circuit 18 based on the calculated value data from the above calculation, and the analog display band 15 displays the image as shown in FIG. 1E. 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 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 point data is input by a signal from an input section (not shown), and latitude data and longitude data are stored in longitude data storage circuits. The meridian data is stored and output in the circuit and latitude data storage circuit, and calculates the time of sunlight in Tokyo as an example. At this time, the meridian data is defined as the meridian data of Tokyo defined by the city number, that is, "135° east longitude". .

First, when the time setting has already been completed and the operation button 4 is turned on, pressing the operation button 5 once and twice causes the second digital display section 9 and the day of the week display section 11 to change. At the same time, the display of "PM" and "24H" on the second mode display section 13 disappears, and the display on the first mode display section 12 becomes blank.
As the display moves from "TIME" to "CITY" and "POINT,""N" is displayed on the second mode display section 13, and the tens digit on the first digital display section 8 flashes. The tens digit value of "degrees" can now be entered. Therefore, by pressing the operation button 7 three times, "Yo" 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".
When pressed once more, "E" is displayed, the hundreds digit on the first digital display section 8 flashes, and the west longitude "degrees" is displayed.
The hundreds digit can be entered. Therefore, when the operation button 7 is pressed once, "1" is displayed in the hundreds digit of the first digital display section 8. Next, as in the case of the northern latitude, the operation buttons 6 and 7 are operated in this order, and when the input of numerical values of all digits is completed, the display state as shown in FIG. 1H is obtained. Then, when the operation button 4 that is in the on state is pressed once to turn it off, the timekeeping state is restored and the calculation is performed in the same way as in case (1), as shown in Figure 1 I. The display state is as follows. 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 dedicated to city number designation, with 2' indicating its main body;
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, by looking at the analog display band 35, it is possible to confirm the sunshine hours and the non-sunshine hours.

In addition, the analog display band 35 is divided into four parts of 90 degrees each,
Each can be configured to specify northern latitude, southern latitude, western longitude, and eastern longitude, and a display function by point specification can also be added.

In this case, according to this embodiment, it is advantageous because it is in 10 minute increments, that is, in 5° increments in terms of degrees.

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) Although the embodiment is applied to a portable wristwatch, the invention is not limited to portable use and can also be applied to ornaments, calendars, electronic notebooks, word processors, computers, televisions, and portable electronic devices. Of course it is possible.

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

(F) Substitute, for example, (7°1′40″) for the coefficient θ in equation (3) and calculate the hour angle at which the center of the sun is at the altitude of the coefficient θ that specifies the above altitude with respect to the horizon. In other words, it is possible to calculate the times of dusk and dawn, and if you input the required altitude into the above coefficient, it will calculate and output the time when the center of the sun passes through that altitude. be.

(G) It is also possible to numerically display sunrise, sunset, dawn, dusk, etc.

(H) Furthermore, when using the present invention, it is of course convenient to use city numbers that are common to longitude, latitude, and meridian data; It is useful to have a table of corresponding numbers or a map showing the location of cities relative to the numbers. This table or map should be written on the back of the watch, on the watch band, etc., or written on a printed matter, special card, etc. for the sunshine time and non-sunshine time display device.

(I) Furthermore, as a means of specifying a city, an alphabet, a symbol, or the city name itself may be used instead of the city number, and various methods such as voice input are possible.

(J) 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 displayed functions and effects, usage methods, 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 sunlight is determined by a coefficient specifying the sun's declination, equation of time, and altitude according to the date, and the latitude and altitude of the required point. It is calculated based on the longitude and the longitude of the standard meridian, and it calculates the time related to sunlight in a rational and effective manner, and requires a large amount of memory compared to the conventional method that memorizes the sunrise and sunset times. The circuit can be simplified because it does not have to be
It is possible to calculate the sunset time in any region.

[Brief explanation of drawings]

1A to 1I are plan views showing the display structure of a sunshine time and non-sunshine time display device that combines the present invention and a clock, and FIG. FIG. 3 is a block diagram showing the structure of the internal circuit related to functions, FIG. 3 is a block diagram showing the structure of the internal circuit related to the calculation and display function of time difference and date of meridian data of different classifications, and FIG. 4 is another embodiment of the present invention. FIG. 3 is a plan view showing an example display structure. 1, 1... Sunshine time and non-sunshine time display device combined with a wristwatch, 24, 26... Time display scale, 15, 31... Analog display band (display section).

Claims (1)

[Scope of Claims] 1. Date data output means for outputting date data, equation of time data output means for outputting equation of time data corresponding to the date, and declination for outputting declination data corresponding to the date. a data output means; a standard meridian data output means for outputting standard meridian data; an input section into which latitude and longitude specific to a point are input; a meridian time output means for outputting a meridian time; an hour angle output means for outputting an hour angle based on a coefficient specifying the declination, latitude, and altitude; A device for outputting time related to sunlight, characterized by comprising an output means for calculating time and outputting a signal. 2 Based on a signal from an output means arranged corresponding to the display scale and which calculates the time related to sunlight and outputs a signal, the time related to sunlight and the time related to non-sunshine are set in different optical states. A time display device related to sunlight according to claim 1, further comprising a display section for displaying the time.