5.0 | 1 rating Rate this file 228 downloads (last 30 days) File Size: 3.14 KB File ID: #17977

Equinoxes and Solstices

12 Dec 2007 (Updated 12 Nov 2008)

compute the dates of equinoxes and solstices

File Information
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.
Acknowledgements	The author wishes to acknowledge the following in the creation of this submission: Geodetic Toolbox This submission has inspired the following: Aggregate timeseries data to solstices and equinoxes.
MATLAB release	MATLAB 7.3 (R2006b)

Tags for This File
Everyone's Tags	clock(2), dates(2), equinox solstice, equinoxes(2), fun, meeus, solstices(2), utilities(2)
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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

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Updates
17 Dec 2007	Help line correction
24 Sep 2008	Improvement in input error handling
12 Nov 2008	Changes in help section

Tag Activity for this File
Tag	Applied By	Date/Time
clock	Giuseppe Cardillo	22 Oct 2008 09:39:06
fun	Giuseppe Cardillo	22 Oct 2008 09:39:06
equinox solstice	Giuseppe Cardillo	22 Oct 2008 09:39:06
dates	Giuseppe Cardillo	22 Oct 2008 09:39:06
equinoxes	Giuseppe Cardillo	22 Oct 2008 09:39:06
solstices	Giuseppe Cardillo	22 Oct 2008 09:39:06
utilities	Giuseppe Cardillo	22 Oct 2008 09:39:06
meeus	Giuseppe Cardillo	22 Oct 2008 09:39:06
utilities	Cristina McIntire	12 Nov 2008 14:04:54
dates	Cristina McIntire	12 Nov 2008 14:04:54
clock	Cristina McIntire	12 Nov 2008 14:04:54
solstices	Cristina McIntire	12 Nov 2008 14:04:54
equinoxes	Cristina McIntire	12 Nov 2008 14:04:54

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