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Calculations:

• Low Accuracy Equations in PDF format
• National Renewable Energy Laboratory Solar Resource Models and Tools
• U.S. Naval Observatory online calculators for solar and lunar position
• JPL's Horizons System accurate ephemerides for solar system objects

Daylight Saving Time:

• Daylight Saving Time information for the U.S.
• Daylight Saving Time on WebExhibits more information
• Canadian Time Zone and Daylight Saving Time
• TimeTemperature.com U.S. Time Zone Map

Education:

• Basics of Space Flight from NASA'a Jet Propulsion Lab
• Phil Plait's Bad Astronomy guide to astronomy misconceptions
• Solar Learning Activities from NASA and Montana State University
• Analemma Page describes how earth's tilt affects us

Latitude and Longitude:

• ZipInfo.com find U.S. lat/long from zip code
• U.S. Census Bureau TIGER Map Service for locations in the U.S.
• PlacesNamed.com Geographic Encyclopedia for U.S.

Time and Timekeeping:

• The Official U.S. Time from the National Institute of Standards and Technology
• A Walk Through Time -- a great overview of the history of timekeeping
• USNO's Systems of Time page Does anybody really know what time it is?
• Local Apparent Sidereal Time from the USNO
• Calendars and Timekeeping from Best of the Web

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Sunrise/Sunset Calculator Solar Position Calculator Calculation Details

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