How do you calculate your sun/moon data?

We use a mathematical formula to calculate the sunrise and sunset in the US. This formula takes into consideration lat/lon and timezone of a particular city. Each zip code may have a different lat/lon; therefore, the sunrise and sunset times may vary slightly.

If you are looking for historical sunrise/sunset data, try the following website. This website also contains moonrise/moonset, moon phase, moon illumination, eclipses, etc.

http://aa.usno.navy.mil/AA/data/

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