earth eccentricity

2009-02-08 Thread Jos Kint
Hello sundialists around the world! Who can help me? I am looking for the algebraic relation between the Equation of time and the eccentricity of the earth orbital. It will help me for calculating this eccentricity with my own sun dial. Chris Lusby Tailor gave me a nice hint with the Ptolemaios

RE: earth eccentricity

2009-02-08 Thread Tom Kreyche
Here are a few references in books, I'm sure there are others on the web: Astronomical Algorithms by Jean Meeus, Second Edition, Chapter 28. Explanatory Supplement to the Astronomical Almanac, Seidelmann et. al, Section 9.311 Spherical Astronomy, by Robin Green, 1985, Section 10.6

Re: earth eccentricity

2009-02-08 Thread Karl Billeter
On Sun, Feb 08, 2009 at 11:38:02AM -0800, Tom Kreyche wrote: Here are a few references in books, I'm sure there are others on the web: Astronomical Algorithms by Jean Meeus, Second Edition, Chapter 28. Explanatory Supplement to the Astronomical Almanac, Seidelmann et. al, Section