Sun Positions, Formulas, & Sundials

by Prof. Richard B. Goldstein

Providence College

Three sites of interest:

1. Sun Positions
  • enter any latitude, longitude, and date/time to find the sun's (approx.)
    position as altitude and azimuth
  • JavaScript Canvas output will show the sun's position for every hour of the day as
    well as the highest and lowest altitudes and the sunrise and sunset
2. Formulas
  • the formulas used, their derivation and explanation are given for the
    above site
3. Sundials
  • enter any latitude to find the sundial settings for each hour
  • formulas and their derivations are given
  • a JavaScript Canvas output will show the actual horizontal sundial face
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