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Links:

• http://williams.best.vwh.net/sunrise_sunset_algorithm.htm
• http://williams.best.vwh.net/sunrise_sunset_example.htm

To get sunrise/sunset data for a year at a clip:
http://www.cmpsolv.com/los/sunsetexp.html

Types of rise/set:

• offical = 90 degrees 50’
• civil (twilight) = 96 degrees
• nautical = 102 degrees
• astronomical = 108 degrees