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The following subroutine, here written in QBasic but easily translatable to other languages, calculates the Equation of Time and the Solar Declination on any day of the year. It is quite accurate. Its Root-Mean-Square error for the Equation of Time is only 3.7 seconds. The Declination is calculated with errors that are always small compared with the angular radius of the sun as seen from the earth (about 0.25 degrees).
The following subroutine, here written in QBasic but easily translatable to other languages, calculates the Equation of Time and the Solar Declination on any day of the year. It is quite accurate. Its Root-Mean-Square error for the Equation of Time is only 3.7 seconds. The Declination is calculated with errors that are always small compared with the angular radius of the sun as seen from the earth (about 0.25 degrees).


A program that includes the routine is ETIMSDEC, which is listed below. Anyone who wants further information should look at the [[Sun related texts]] page. The article titled "The Latitude and Longitude of the Sun", which I wrote several years ago, describes the astronomical logic behind the routine.
Anyone who wants further information should follow the following link: [[http://www.green-life-innovators.org/tiki-index.php?page=Sunalign Link]]
The program that includes the routine is ETIMSDEC. There are instructions how to run it. The article titled "The Latitude and Longitude of the Sun", which I wrote several years ago, describes the astronomical logic behind the routine.


[[User:DOwenWilliams|DOwenWilliams]] 10:19, 18 May 2011 (PDT) David Williams
[[User:DOwenWilliams|DOwenWilliams]] 10:19, 18 May 2011 (PDT) David Williams
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