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For latitudes greater than 72° N. and S. calculations are accurate
to within 10 minutes. For latitudes less than 72° N. and S. accuracy
is within 1 minute.
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.
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Latitude and Longitude are in deg/min/sec. If you select an airport 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,
select "Enter Lat/Long -->" from the Airport pulldown menu.
You can enter changes to a selected airport by selecting "Enter Lat/Long -->"
in the Airport pulldown box after you have previously
selected the desired airport. The stored values will remain loaded.
Selecting "Yes" in the Daylight Saving field will cause the resulting sunrise and
sunset times to be adjusted forward one hour.
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. You will need to click the "Calculate
Sunrise/Sunset" button to update the results for this date.
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