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Equinoxes and Solstices

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Equinoxes and Solstices

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12 Dec 2007 (Updated )

compute the dates of equinoxes and solstices

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Description

EQNSOL computes the date of equinoxes and solstices for the input year.This is based upon the formulas given by Jean Meeus in his "Astronomical Algorithms". The date is computed in Julian Date.
This function take in JD2CAL function of "Geodetic Toolbox" by Mike Craymer (ID:15285) to convert Julian Date into Gregorian calendar date.

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Acknowledgements

Geodetic Toolbox inspired this file.

This file inspired Aggregate Timeseries Data To Solstices And Equinoxes..

MATLAB release MATLAB 7.3 (R2006b)
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Comments and Ratings (1)
01 Jun 2009 Jeff Burkey

Great function! While the level of accuracy does not affect my needs, you may want to let others know if they are in need to to the minute or second, may want to validate the results. Comparing this functions results to the US Naval Observatory, the results differ by approximately 1-minute. I'm guessing this is an artifact of matlab and complier precision. Anything dealing with astronomy and floating point precision becomes significant.

http://aa.usno.navy.mil/data/docs/EarthSeasons.php

Updates
17 Dec 2007

Help line correction

12 Nov 2008

Changes in help section

23 Dec 2009

Changes in description

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