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Sunrise and Sunset Calculator
Must Adjust for Daylight Savings!

City:
Deg:
Min:
Sec:
Time Zone
Lat:
North=+
South=-
Offset
to UTC
(MST=+7):
Daylight
Saving
Time
:
Click here for help finding
your lat/long coordinates
Long:
West=+
East=-
Note: To manually enter latitude/longitude, select Enter Lat/Long -> from the
City pulldown menu, and enter the values in the text boxes to the right.


Month:
Day:
Year (e.g. 2000):



Equation
of Time

(minutes):
Solar
Declination

(degrees):
Apparent
Sunrise
:
Solar Noon:
Apparent
Sunset
:
Time
Zone
Local
UTC




Directions for Use:

  1. Select a location from the City pulldown menu, OR select "Enter Lat/Long ->" from the pulldown menu, and manually enter the latitude, longitude and time zone information in the appropriate text boxes. The following sign conventions are used:

    Longitude: Latitude:
    Positive in Western Hemisphere Positive in Northern Hemisphere
    Negative in Eastern Hemisphere Negative in Southern Hemisphere

    Latitude and Longitude can be in deg/min/sec, or decimal degrees entered in the "Deg:" field. If you select a city from the pulldown menu, the latitude, longitude and time zone fields will be filled in automatically. If you want to input latitude, longitude or time zone manually, be sure to select "Enter Lat/Long -->" from the City pulldown box, or your numbers will be overwritten by the selected city's location.


  2. You can enter a different time zone for a location by selecting "Enter Lat/Long -->" in the City pulldown box. Otherwise, the time zone associated with the selected city's Local Standard Time will be automatically entered. Selecting "Yes" in the Daylight Saving field will cause the resulting sunrise, sunset and solar noon times to be adjusted forward one hour. If you are uncertain of the time zone for a location, refer to our Time Zone Table.

  3. The program retrieves the current date from your computer, and fills the month, day and year fields. To perform calculations for a different date, simply select a month in the pull down menu, and enter the day and four digit year in the appropriate input boxes. When entering a day or year, you will need to click the "Calculate Sunrise/Sunset" button to update the results for this date.

  4. Once the calculation results are displayed, you may use your web browser's "Print" function to obtain a hardcopy of the results.

  5. For locations above the Arctic Circle and below the Antarctic Circle, when a sunrise or sunset does not occur on the given day the program locates the local time and date of the most recent sunrise or sunset, and the next sunset or sunrise. When this occurs, the UTC fields will display "prior" or "next" information instead of the UTC times.

  6. NOTE: For latitudes greater than 72 degrees N and S, calculations are accurate to within 10 minutes. For latitudes less than +/- 72° accuracy is approximately one minute. See Solar Calculation Details for further explanation.


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