JP2822452B2 - Sunrise / sunset time display control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sunrise / sunset time display control device capable of displaying sunrise / sunset times in cities around the world.

[Related Art] Recently, there has been an increasing demand to know the sunrise / sunset time on the day for outdoor activities such as sports and fishing. For example, if you play baseball on a ground without night game equipment, you can know how long you can play in the evening if you know the sunset time. In addition, when fishing, the fish bite well at the sunrise time and the sunset time, so that it is possible to know when to start fishing and to catch the fish. Further, if it is possible to know not only the sunrise / sunset times of the current region, but also the sunrise / sunset times of each city in the world and the relationship between the sunrise / sunset times of each city and the current time of each city, for example, it is possible to obtain information such as electric power. Therefore, there is a demand for a device which is very convenient for greeting the time and the like, and which can easily and easily display sunrise / sunset information of each city in the world.

[Problems to be Solved by the Invention] An object of the present invention is to provide a sunrise / sunset time display control device capable of efficiently displaying the current time and sunrise / sunset information of each city in the world with a simple operation. I do.

Means for Solving the Problems In order to achieve the above object, the present invention provides a position data storage unit for storing position data of a plurality of cities on the earth,
A city designation switch for sequentially and selectively designating the plurality of cities; a time counting means for obtaining time / date data; and a city designation switch for selectively designating the plurality of cities based on the time / date data obtained by the time counting means. Means for calculating the current time / date data of the selected city, first display control means for displaying the current time / date data of the city obtained by the selected city time calculation means, and display of the sunrise / sunset time When the current time / date data of the selected and designated city is displayed by the switch and the first display control means, and the sunrise / sunset time display switch is operated, the city selection designation is performed. Based on the position data of the city selected and specified by the switch and the date data, the sunrise / sunset time data of the selected and specified city is calculated. A sunrise / sunset time calculation means for calculation, and characterized by including a second display control means for displaying the sunrise / sunset time data obtained in this sunrise / sunset time calculating means.

According to the present invention, when a city is designated by the city designation switch, the current time of the city is immediately displayed. Then, operating the sunrise / sunset time display switch while the current time of the specified city is displayed,
The sunrise / sunset time of the specified city is calculated and displayed. Therefore, the current time of each frequently used city can be immediately displayed, and the calculation of the sunrise / sunset time of each city that is not frequently used and takes a long time to calculate is performed only when necessary, and the operability is good. A very convenient device can be obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing the appearance of an electronic wristwatch to which the present invention is applied. Note that this electronic wristwatch has a world clock function for displaying the time of each city in the world. In FIG. 1, reference numeral 10 denotes a display unit constituted by, for example, a liquid crystal display device, which is incorporated in a watch case 20. The watch case 20 has a watch glass to protect the display unit 10.
30 are provided. Further, switches S ₁ and S ₂ are provided on the left side of the watch case 20, and a switch S ₃ is provided on the right side thereof.

Switch S _1, in the time display mode sequentially along with the switch the clock display in each city in the world, is a switch to update the digit to be corrected in time correction mode. Switch S
Reference numeral ₂ denotes a switch for alternately switching between a time display mode and a time correction mode. Switch S ₃ along with switching the time display mode and month status data display mode alternately, the time correction mode is a switch to modify the selected digit.

Display Configuration FIG. 2 is a diagram showing a segment configuration of the display unit 10 constituted by a liquid crystal display device. The display unit 10 is divided into two display units. The upper half is composed of a negative display liquid crystal display device, and is a graphic display unit 11 that graphically displays the moon phase as moon state data, and the lower half is a positive display unit. The numerical value display unit 12 is configured by a liquid crystal display device for display, and displays the age of the moon as a numerical value as the moon state data and the current time.

The graphic display unit 11 is provided with moon phase indicators 11a1 to 11a9 for displaying various moon phases such as a new moon, a first quarter, a full moon, and a lower quarter, and sunrise / sunset indicators 11b1 and 11b2. It is displayed in white color against a black background. Also,
A large number of star-shaped indicators around the moon phase indicators 11a1 to 11a9 indicate a state in which the stars are shining.
An arbitrary display is selectively blinked every second.

The numeric display section 12 includes time display bodies 12a and 12b each composed of a seven-segment type numeric display body, and a dot matrix display body 1
2c and a symbol display 12d which is displayed when the moon age (MOON AGE) data is displayed on the display 12c are provided, and these displays are displayed in black against a white background.

Circuit Configuration FIG. 3 is a block diagram showing a circuit configuration of the electronic wristwatch. In the figure, 1 is an oscillation circuit for generating a clock pulse, 2 is a frequency divider for dividing the clock pulse generated from the oscillation circuit 1, and 3 is a timing signal for generating various timing signals based on the clock pulse. It is a generating circuit. The frequency division output of the frequency dividing circuit 2 and the timing signal generated from the timing signal generating circuit 3 are input to the control unit (CPU) 4.

The control unit 4 has a built-in microprocessor, executes various processes, and controls the operation of the entire circuit. The control unit 4 is connected to a program ROM 5, a data ROM 6, a key input unit 7, a RAM 8, and a decoder / driver circuit 9. .

The program ROM 5 is a ROM in which a microprogram for the control unit 4 to execute various processes and an arithmetic program for executing the age calculation described later are recorded in advance.

The data ROM 6 is a ROM in which character information of various numbers or characters, time difference data indicating a time difference between Greenwich Mean Time (GMT) and each city, and position information indicating the latitude and longitude of each city are stored in advance.

The key input unit 7 includes the switches S _{1 to} S ₃ shown in FIG. ₁ , and outputs a key input signal corresponding to a switch operation to the control unit 4.

The RAM 8 stores various data, and writes and reads data under the control of the control unit 4. RA
The memory configuration of M8 will be described later with reference to FIG.

The decoder / driver circuit 9 is output from the control unit 4
A display drive signal is generated based on the display data of the RAM 8 and supplied to the display unit 10.

FIG. 4 is a diagram showing a configuration of the time difference data stored in the data ROM 6. This time difference data is the time difference from GMT,
The corresponding city name (abbreviation) is stored. As shown in the figure, for example, the time difference of New York is “−05 (hour)”, and the city name (abbreviation) is “NYC”. Although not shown, the data ROM 6 stores, for each city, latitude data and longitude data indicating the position of the city.

RAM8 Configuration FIG. 5 is a diagram showing a memory configuration of the RAM8. As shown in the figure, a RAM 8 has a display register X for storing display data sent to the decoder / driver circuit 9, a city register C for storing a city No. for designating a city, and a moon age register Y for storing moon age data. , A current time register T for counting and storing current time data including the date, and a flag register for storing a correcting flag indicating that data is being corrected.
F ₀ , a flag register F ₁ for storing a moon age display flag indicating that moon age data is being displayed, a sunrise time register L for storing sunrise time data, a sunset time register M for storing sunset time data, and a large number of registers for calculation Z _o
Composed of a ~Z _n. The operation register Z _o to Z _n are of age calculation to be described later, in addition to use in the sunrise / sunset calculations, corresponding to the city stored in the city register C, ROM 6
Time difference data from GMT and latitude (Latitud
e) Used as a register for temporarily storing data and Longitude data.

Operation Next, the operation of the above embodiment will be described with reference to FIGS. 6 to 12. Here, FIG. 6 shows the relationship between the lunar phases corresponding to the ages (0 to 29.5 days) and the lunar phases 11a1 to 11a9 of the display unit 10 selected and displayed according to the ages. It is. 7 is a flowchart showing the overall operation, FIG. 8 is a flowchart showing the operation of the age calculation process in FIG. 7, FIG. 9 is a flowchart showing the operation of the display process in FIG. 7, and FIG. 8 is a flowchart showing an operation of a sunrise / sunset time calculation process in FIG. FIGS. 11 and 12 are diagrams each showing a change in the display state associated with a switch operation.

Time display mode Normally, as shown in FIG. 11 (B),
For example, the display unit 10 displays "NYC 6-26 ^P 10: 5850" according to the contents of the city register C and the time register T, and displays the current time in New York (June 26, 1989, 10:58 pm
50 seconds). This state is the time display mode, and the contents of the flag registers F ₀ and F ₁ are both “0”.
At this time, the control section 4 repeatedly executes the processing of steps A1 to A3 and A5 in the flowchart of FIG.
That is, until the timing signal generation circuit 3 outputs the 16 Hz clock signal, the control unit 4 is in the HALT (waiting) state and remains in step A1.

If the time signal is output, step A1
, And the process proceeds to step A2. Steps
In A2, the control unit 4 executes a timing process for advancing the content of the current time register T, and proceeds to step A3.

In step A3, the date is updated by the above-described timing processing, and it is determined whether or not there is a day carry. In this case, since the date has not been updated yet, it is determined to be NO (in the figure, simply described as N. The same applies hereinafter), and the process proceeds to the display processing in step A5.

Details of this display processing are as shown in FIG. First, the content of the flag register F ₀ at step C1 is whether "0" is determined. Now, the contents of the flag register F _0, the process proceeds to YES next step C2 is "0". Step C2
In, the content of the flag register F ₁ whether "0" is determined. Because the contents of the flag register F ₁ is also "0" YE
S is determined and the process proceeds to step C3. In step C3, the city name "NYC" is read from the data ROM 6 based on the content "7" of the city register C and stored in the display register X, and the date data and time data of the current time register T are read. The result is stored in the display register X. Also, based on the content “22.4” of the moon age register Y described later,
The display data for selecting the moon phase display body 11a7 is the display register X.
Is stored. Then, display data based on the contents of the display register X is sent to the decoder / driver circuit 9 and displayed on the display unit 10. That is, in the numerical value display unit 12, the city name "NYC" is displayed on the dot matrix display 12c, the current time " ^P 10: 5850" is displayed on the time display 12a,
The current date “6-26” is displayed by the time display 12b. Further, in the graphic display section 11, a lunar phase (lower crescent month) corresponding to the lunar age "22.4" is displayed by the lunar phase display body 11a7.
After the execution of step C3, the processing of FIG.
Return to step A1 in the figure.

When the date is updated In the time display mode, the date is updated by the timekeeping process in step A2 described above, and in step A3, "day carry"
Is determined, the age calculation process of step A4 is executed.

The details of the moon age calculation process are as shown in FIG. In this embodiment, the moon age and the moon phase at noon time of the displayed city are displayed. Therefore, first, based on the contents of the step B1 the current time register T, stores the noon time of day in terms the operation registers Z ₀ to Greenwich time (current time in Greenwich). For example, if Tokyo is on September 9, 1989, the noon time is 12:00 pm on September 9, 1989, and the time difference between Tokyo is +9 hours with respect to Greenwich Mean Time (GMT). It will be 3:00 am on September 9, 1989.

In the next step B2, the glitch time stored in the operation register Z ₀ calculates the variable t operation register
It is stored in the Z _1. This variable t is obtained by the following equation.

t = (reference days up to January 1, 2000 AD-reference days up to current date) 日 days in 100 years (36525 days) Here, the reference days are reference days (for example, January 1, 1900)
Days) as the starting date.

In step B3, is stored in the operation register Z ₂ is calculated Huang through A view of the moon. Lunar visual meridian A [deg] is obtained by the following equation.

 Lunar visual meridian A = 481267.9 × t + 218.3 + 6.3 × cos (45 + 477200 × t) + 1.3 × cos (11 + 413300 × t) After execution of step B3, step B4 is executed.

In step B4, it is stored in the operation register Z ₃ calculates the sun visual celestial longitudes B. The optic longitude B [deg] of the sun is obtained by the following equation.

Solar visual celestial longitudes B = 36000.8 × t + 280.5 + 1.9 × cos (268 + 36000 × t) will be stored in the operation register Z ₄ calculates the θ elongation step B5 the moon and the sun. Separation θ [deg] between the moon and the sun
It is obtained by the following equation.

Separation angle θ = moon's optic meridian A-sun's optic meridian B = Z ₂ -Z _3, that is, the result of subtracting the contents of operation register Z ₃ from the contents of operation register Z ₂ is the operation register Z ₄ memorized.

Subsequently, in step B6, the age is calculated and stored in the age register Y. The age of the moon is calculated by the following equation.

Moon age = Average lunar month cycle × (separation angle θ） 360) = 29.53 × (Z ₄ ÷ 360) After execution of step B6, the moon age calculation processing of FIG. 8 is terminated, and step A5 of FIG. That is, the process proceeds to the display process shown in FIG.

As described above, since F ₀ and F ₁ = 0, YES is determined in steps C1 and C2, and the process proceeds to step C3. Step C3
In the above, the moon phase display bodies 11a1 to 11a9 corresponding to the moon ages calculated by the moon age calculation processing in step A4 are selected and the display unit 10 is displayed.
Is displayed on the graphic display unit 11. After the execution of this step C3, the display processing of FIG. 9 ends, and the process returns to step A1.

Then when operating the switch S _1, and operates the switch S ₁ at time display mode shown in FIG. 11 (B), it is determined that there is the key in step A1 of FIG. 7 proceeds to step A6. Switch in step A6
Whether S ₁ is being operated or not. In this case, the determination is YES, and the process proceeds to step A7. In step A7, the content of the flag register F ₀ is whether "0" is determined. Now, since “F ₀ = 0”, the result is YES, and step A8 is executed. In step A8 flag register F ₁ of contents whether "0" is determined. Now, since “F ₁ = 0”, the result is YES, and step A9 is executed. In step A9, the content of the city register C is incremented by 1 to "8", and step A10 is executed. In step A10, the content of the current time register T is incremented by "+1 hour". After performing step A10, the process returns to step 1A. This allows
Since the city register C is incremented by one and the content of the current time register T is incremented by "+1 hour", the time of Caracas (CARACAS) is displayed on the display unit 10 in the display processing of step A5 as shown in FIG. Is displayed.

If NO ("F ₀ = 1") is determined in step A7, the digit to be corrected is updated in step A11 because the mode is the correction mode.

FIG. 12 when operating the switch S ₂ is intended particularly showing changes in display state in the time display mode, Fig. 12 (A) is Fig. 11 (B) and the same current time display mode, Figure 12 ( B) shows the same month state data display mode as in FIG. 11 (D), and FIGS. 12 (C) to 12 (G) show the time / position data correction mode.

In the current time display mode shown in Fig. 12 (A), it is determined that there is the key in step A1 of FIG. 7 and operates the switch S ₂ proceeds to step A6. In step A6, switch S ₂
Has been operated, NO is determined and step A12 is executed. In step A12, whether the switch S ₂ is operated is determined. In this case, the determination is YES and the process proceeds to step A13. In step A13, the flag register F ₁
Is determined as to whether or not the content is “0”. Now, “F ₁ = 0”
Therefore, the result is YES, and Step A14 is executed. If the determination in step A13 is NO, the switch S
The operation of ₂ becomes invalid and returns to step A1.

Step A14 In the content of the flag register F ₀ whether "0" is determined. Now, since “F ₀ = 0”, the result is YES, and step A15 is executed. By step A15,
Down "1" in the flag register F ₀ is written the time / position data correction mode is set. Step A14
Is NO, that is, if "F ₀ = 1" is determined, the process proceeds to step A17, where "0" is written into the flag register F ₀ . As a result, the mode is changed from the time / position data correction mode to the time display mode. After the execution of step A17, the process proceeds to step A4, and the age calculation process is executed as described above.

After the execution of step A15, the process proceeds to step A16, in which the second digit is selected from the displayed current time data, and the data can be corrected. After performing step A16, the process returns to step A1. Hereinafter, steps A1 to A3 are executed in the same manner as described above,
When the display processing of step A5 is executed, NO is determined in step C1 of FIG. 9, that is, “F ₀ = 1”, and step C5 is performed.
Is executed. In step 5C, the time data of year, month, day, hour, minute, and second are stored in the display register and displayed on the display unit 10, and the second digit selected in step A16 is set to the flashing display. As a result, as shown in FIG. 12 (C), the second digit of the time display body 12a is displayed by flashing. After the execution of step C5, the processing of FIG.
Return to step A1 in the figure.

Operating the switch S ₁ in this state, it is determined that there is the key in step A1 of FIG. 7 proceeds to step A6. Steps
Whether the switch S ₁ at A6 is operated is determined. In this case, the determination is YES, and the process proceeds to step A7. Step A
In 7, the contents of the flag register F ₀ is whether "0" is determined. Now, the time / position data correction mode has been set, and since “F ₀ = 1”, the determination is NO, and step A11 is executed. In step A11, the digit to be corrected is updated and a minute digit is selected. In other words, by operating the switch S ₁ at time / position data correction mode, the digit to be modified is sequentially updated with the second → minute → hour → day → month → year. FIG. 12 (D) shows a state in which the year digit is selected and flashes instead of seconds.

Thus, by operating the switch S ₁ in the state of Fig. 12 (D), now becomes a modified state of the time difference data, Figure 12 in New York City, as shown in (E) the time difference data "GMT -
"5" is displayed in the flashing display.

Moreover, by operating the switch S ₁ in the state of Fig. 12 (E), it will modify the state of the longitude (Longitude) data, 12
As shown in Fig. (G), the longitude data "W74 ゜ (west longitude 74
Is displayed.

When operating the switch S ₁ in the state of Fig. 12 (G), latitude (Latitude) will modify the state of data, latitude data as shown in Fig. 12 (F) "N41 ° (41 ° N)"
Is displayed. Therefore, the user can set arbitrary position data, that is, longitude and latitude data. In addition,
Operating the switch S ₁ in the state of Fig. 12 (F), again becomes the second digits of the modified state as shown in Fig. 12 (C).

When operated the switch S ₃ then, if you want to change the time display mode shown in FIG. 11 (B) a month state data display mode, operates the switch S _3. By this operation, it is determined in step A1 of FIG. 7 that there is a key, and the flow advances to step A6. Thereafter, in the same manner as described above, NO is determined in each of steps A6 and A12, and the process proceeds to step A18. In step A18, the content of the flag register F ₀ is "1" or not is determined. Now, since “F ₀ = 0”, the result is NO, and step A20 is executed. Note that if YES is determined in step A18, the time is the time correction mode, and the correction digit is corrected in step A19.

In step A20, the content of the flag register F ₁ is "0"
Is determined. Now, since “F ₁ = 0”, YES
And step A21 is executed. In step A21, "1" is written in the flag register F ₁ is set month data display mode proceeds to step A22. Incidentally, NO in step A20, that is, if it is determined that F ₁ = 1 "," 0 "is written into the flag register F ₁ proceeds to step A23. As a result, the mode is changed from the month data display mode to the time display mode. After executing step A23, the process returns to step A1.

In step A22, a sunrise / sunset time calculation is executed. The details of the calculation of the sunrise / sunset time are as shown in FIG.

First, in step S1, the time difference between the city (New York) stored in the city register C and Greenwich is stored in the "year, month, day,
"Year, month time," the in Greenwich, day, "year time" and in Greenwich, month, day, in terms of the time "is stored in the operation register Z _0. For example, New York is June 26, 1989
At 10:58 pm on the day, the time difference for New York is “-5 hours” from Greenwich Mean Time (GMT), so Greenwich Time is 3:58 am on June 27, 1989, the next day. Therefore, the operation registers Z ₀ date data "19
89062703 "is stored.

Then, based on the date data "1989,06,27,03" stored in operation register Z ₀ in step S2, calculating a calculated variable α for sunrise / sunset time calculation. The calculation variable α indicates the number of days from January 1 of the input date to the input date, and is calculated by the following equation. Here, year = YE, month = MN, day = DA. In this case, YE = 19
89, MN = 6, DA = 27.

W = (YE-1900) / 4 F = FRAC (W) A = INT (1461 × W) B = INT [(MN + 7) / 10] C = INT (1-F) D = INT [0.44 × (MN + 4. 4)] Y = A + 31 × MN + DA + (B-1) × C−B × D W = (YE-1900) / 4 F = FRAC (W) A = INT (1461 × W) B = INT [(1 + 7) / 10] C = INT (1-F) D = INT [0.44 × (1 + 4.4)] YY = A + 31 + (B−1) × C−B × D Calculation variable α = Y−YY This calculation variable α is used for calculation. It is stored in the register Z _1.

In step S3, operation registers Z ₀ to store the date data "1989,06,27,03," based on, it calculates the calculated variable s for sunrise / sunset time calculation. This calculation variable s is obtained by the following equation. Here, year = YE, month = MN, day = DA, hour = HO. In this case, YE = 1989, MN
= 6, DA = 27, HO = 3.

W = (YE-1900) / 4 F = FRAC (W) A = INT (1461 × W) B = INT [(MN + 7) / 10] C = INT (1-F) D = INT [0.44 × (MN + 4. 4)] Z = a + 31 × MN + DA + (B-1) × C -B × D + HO / 24 calculation variables s = (Z-36556.) / 36525 this calculation variable α is stored in the operation register Z _2.

In subsequent step S4, it calculates the equation of time KJS based on the calculated variables α stored in the operation register Z ₁ [sec].
The equation of time KJS is obtained by the following equation.

A = (α−80.5) × 360 / 365.25 B = (α−4.5) × 360 / 365.25 C = −460.64 × SIN (B) −4.82 × SIN (2 × B) D = 592.32 × SIN (2 × A) -12.7 6 × SIN (4 × a ) equation of time KJS = C + D [sec] the equation of time KJS is stored in the operation register Z _3.

Next, in step S5, longitude, GMT time difference, and equation of time K
Calculate the median time (local average solar time) by JS. Here, since the longitude data and the GMT time difference data are stored in the data ROM 6 corresponding to each city, the longitude data and the GMT time difference data of New York are read from the data ROM 6. The median time is obtained by the following equation.

Median time = 12-longitude / 15 ゜ = GMT time difference-equation of time / 3600
[Hour] The sign of longitude is “+” in east longitude and “−” in west longitude.

Then, in step S6, the declination δ of the sun is calculated using the variable s.

 The declination δ of the sun is obtained by the following equation.

Sun's declination δ = 23.26 × cos (36001 × s + 190) + 0.39 × cos (2 × s + 13) + 0.39 × cos (72000 × s + 1
88) + 0.16 × cos (108002 × s + 211) + 0.01 × cos (72003 × s + 34) + 0.01 × cos (144001 × s + 209) viewed declination δ of the sun are stored in the operation register Z _5.

Next, in step S7, the sunrise / sunrise count is calculated based on the latitude φ and the declination δ of the sun. The count at sunrise / sunrise is calculated by the following equation.

A = TAN (φ) × TAN (δ) B = −0.017 / COS (φ) × COS (δ) Count at sunrise / sunrise = {arcCOS (BA)} / 15 ゜ [hour] the number is stored in the operation register Z _6.

Finally, in step S8, the calculated number of time infested stored day operation registers Z ₆ and time stored in the operation register Z ₆ midline, to calculate the sunrise time and the sunset time. The sunrise time and the sunset time are respectively obtained by the following equations.

Sunrise time = Midtime-Count of sunrise / sunrise [hour] Sunset time = Midnight + Count of sunrise / sunrise [hour] Then, the sunrise time is stored in sunrise time register L, and the sunset time is stored in sunset time register M, respectively. It is memorized. After the execution of step S8, the sunrise / sunset time calculation processing of FIG. 10 ends, and the process returns to step A1 of FIG. As described above, when steps A1 to A3 are executed and the display processing of step A5 is executed, step C2 of FIG. 9 is executed.
Is determined to be “F ₁ = 1”, and step C4 is executed. In step C4, the sunrise time of New York stored in the sunrise time register L, for example, "5:25 am" is read out and written in the display register X, and the sunset time stored in the sunset time register M, for example, "8:
35pm "is read out and written into the display register X. Further, the content “22.4” of the moon age register Y is stored in the display register X, and a sunrise / sunset mark is stored in the display register X. In addition, the content of the moon age register Y “2
Based on “2.4”, display data for selecting the moon phase display body 11a7 is stored in the display register X. Then, display data based on the contents of the display register X is sent to the decoder / driver circuit 9, and the decoder / driver circuit 9 outputs a display drive signal to the display unit 10.

As a result, as shown in FIG.
In New York, the sunrise time `` 5:25 am '' is displayed by the time display 12b, the sunset time `` 8:35 pm '' is displayed by the time display 12a, and the age of the moon `` 22.4 '' is numerically displayed by the dot matrix display 12c. At the same time, a symbol display 12d indicating the age of the moon (MOON AGE) is displayed. Further, in the graphic display section 11, a lunar phase corresponding to the age of the moon (lower-moon moon) is displayed by a lunar phase display 11a7, and sunrise / sunset display 11b1 and 11b2 are displayed. After the execution of step C4, the process of FIG. 9 ends, and the process returns to step A1 of FIG.

In the above embodiment, an example in which the present invention is applied to an electronic timepiece with a world clock function is shown. However, the present invention can be applied to an electronic timepiece without such a world clock function, and does not have a timekeeping function of the current time. Even if it is not a clock, a key input means for inputting year / month / day data, time difference, position data, etc. may be provided to calculate and display the sunrise / sunset time of the input date. Good.

Further, in the above embodiment, the sunrise / sunset time on the current day is displayed. However, the date data is changed to "+1 day" or "-1 day" by a switch operation to obtain arbitrary date data. May be displayed.

[Effects of the Invention] As described above in detail, according to the present invention, when a city is designated by the city designation switch, the current time of the city is displayed, so that the current time of each frequently used city is immediately set. When the sunrise / sunset time display switch is operated while the current time of the specified city is displayed, the sunrise / sunset time is calculated and displayed. Such sunrise /
The sunset time is calculated only when needed,
An apparatus with good operability and very good usability can be obtained.

[Brief description of the drawings]

1 to 12 show an embodiment of the present invention. FIG. 1 is a front view showing an external structure, and FIG.
FIG. 3 is a block diagram showing a circuit configuration,
FIG. 4 is a diagram showing the data of the data ROM 6, FIG. 5 is a diagram showing the configuration of the RAM, FIG. 6 is a diagram showing the relationship between the age of the moon and the lunar phase, FIG. FIG. 11 and FIG. 12 are diagrams showing changes in the display state. 1 oscillation circuit, 2 frequency divider circuit, 3 timing signal generation circuit, 4 control unit, 5 program ROM, 6
... Data ROM, 7 ... Key input section, 8 ... RAM, 9 ...
Decoder / driver circuit, 10 display unit, 11 graphic display unit, 11a1 to 11a9 moon phase display, 11b1, 11b2 sunrise / sunset display, 12 numerical display unit, 12a, 12b …
Time display, 12c ... dot matrix display, 12d ...
Symbol display, 20… Watch case, 30… Watch glass.

Claims (1)

(57) [Claims] 1. A position data storage means for storing position data of a plurality of cities on the earth, a city designation switch for sequentially and selectively designating the plurality of cities, a time counting means for obtaining time / date data, A selected city time calculating means for obtaining the current time / date data of the city selected and designated by the city specifying switch based on the time / date data obtained by the time counting means; Current time of city /
First display control means for displaying date data, sunrise / sunset time display switch, and when the current time / date data of the selected and designated city is displayed by the first display control means,
When the sunrise / sunset time display switch is operated, the sunrise / sunset time data of the selected city is calculated based on the position data and the date data of the city selected and specified by the city selection specification switch. Sunrise / sunset time calculating means; and second display control means for displaying sunrise / sunset time data obtained by the sunrise / sunset time calculating means. apparatus.