Ekliptik: Perbezaan antara semakan
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* {{en}} [http://astro.unl.edu/naap/motion1/animations/seasons_ecliptic.html Seasons and Ecliptic Simulator] University of Nebraska-Lincoln
* {{en}} [http://stars.astro.illinois.edu/celsph.html MEASURING THE SKY A Quick Guide to the Celestial Sphere] James B. Kaler, University of Illinois
* {{en}} [http://aa.usno.navy.mil/data/docs/EarthSeasons.php Earth's Seasons] {{Webarchive|url=https://web.archive.org/web/20071013000301/http://aa.usno.navy.mil/data/docs/EarthSeasons.php |date=2007-10-13 }} U.S. Naval Observatory
* {{en}} [http://www.astrologyclub.org/articles/ecliptic/ecliptic.htm The Basics - the Ecliptic, the Equator, and Coordinate Systems] AstrologyClub.Org
* {{en}} {{cite journal
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