Fred Jaicks  Written and compiled by Fred Jaicks


Astronomical Terms


  • Daylight Chart: Free, downloadable program that allows users to display, customize, save and print, sunrise and sunset charts for a whole year at any location in the world.
  • Day and Night World Map: See what parts of the Earth are experiencing day light and in what parts it is nighttime.

Moon Phases and Positions

 Solar Energy Information

  • Energy Sources: Information on solar energy from the United States Department of Energy.
  • Solar Energy: Benefits of solar energy including studies and maps presented by the United States Department of the Interior Bureau of Land Management.
  • Solar Energy Sites: List of several sites pertaining to Solar Energy.

Sun Position (Azimuth and Altitude)

  • Altitude and Azimuth: Basic definition of the terms including diagrams. 
  • Solar Position Calculator: Use to calculate declination, solar zenith angle, Julian day, hour angle, equation of time, sunrise and sunset times, and daily and instantaneous extraterrestrial radiation values from the University of Oregon Solar Radiation Monitoring Laboratory.
  • Patio Umbrellas: At the hottest and brightest part of the day, you may want to relax in the shade to stay cool.
  • Azimuth/Altitude Demonstrator: Shows how altitude and azimuth define an object’s position in the sky.
  • The Sun & RV Airplanes: Resources pertaining to both engineering and sun calculation.
  • Maritime Consultant: Maritime resources including info on boating, the Coast Guard and the sun.

Sunrise/Sunset Calculators

  • Sunrise Calculator: National Oceanic & Atmospheric Administration Sunrise Calculator
  • WxCam Sunrise/Sunset/Twilight Calculator: Calculate civil/nautical, sunrise, sunset, and twilight for any earthly location by entering longitude and latitude.
  • Sunset Computer: Compute sunrise, sunset & twilight for cities & airports worldwide with time zones.
  • GAISMA: Interactive map that provides sunset, sunrise, dawn and dusk times for thousands of locations around the planet.

Sun Calendars

  • Sun/Moon Calendar: View the sun/moon calendar for a one year period.
  • Aztec Calendar: Images and description of the sun stone.
  • MVPs: Date and time formatting on computers and for the sun.