Sistem koordinat ekuator: Perbedaan antara revisi
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== Referensi ==
* Winardi Sutantyo; ''Astrofisika Mengenal Bintang''; Bandung: Penerbit ITB, 1984.▼
* [http://stars.astro.illinois.edu/celsph.html MEASURING THE SKY A Quick Guide to the Celestial Sphere] James B. Kaler, University of Illinois
▲Winardi Sutantyo; ''Astrofisika Mengenal Bintang''; Bandung: Penerbit ITB, 1984.
* [http://astro.unl.edu/naap/motion1/cec_units.html Celestial Equatorial Coordinate System] University of Nebraska-Lincoln
* [http://astro.unl.edu/naap/motion1/cec_both.html Celestial Equatorial Coordinate Explorers] University of Nebraska-Lincoln
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