Analemma Generator

Interactive Tool for Generating Analemmas

Al Guzman has created a spreadsheet which will generate a table of intermediate calculations and a completed analemma in graphical form based on three input values.

  • the axis inclination (set at a default value of 23.5)
  • orbit eccentricity (set at .017)
  • perihelion's day after the winter solstice (set at January 3 - December 21 = 13)

For full discussion of the Sun's apparent position in the sky during one full year, see the lead article in the January 2008 Asterism, also written by Al Guzman (Click Newsletter at left).

Click here for the Al Guzman's analemma generating spreadsheet.

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Page last updated 01/15/2008