Editing Ganymede (moon) (section)

==History==
Chinese astronomical records report that in 365 BC, [[Gan De]] detected what might have been a moon of Jupiter, probably Ganymede, with the naked eye.<ref name="ads.793b">{{cite journal |bibcode=1981BAAS...13..793B |title=Ancient Astronomy in Modern China |journal=Bulletin of the Astronomical Society |volume=13 |page=793 |last=Brecher |first=K. |date=1981 }}</ref> However, Gan De reported the color of the companion as reddish, which is puzzling since moons are too faint for their color to be perceived with the naked eye.<ref name=encyc>{{cite encyclopedia
 | first=Huang | last=Yi-Long | editor=Helaine Selin |editor-link=Helaine Selin | title=Gan De | encyclopedia=Encyclopaedia of the history of science, technology, and medicine in non-western cultures
 | page=342 | publisher=Springer | date=1997 | url=https://books.google.com/books?id=GzjpCAAAQBAJ&pg=PA342 | isbn=978-0-7923-4066-9 }}</ref> [[Shi Shen]] and Gan De together made fairly accurate observations of the five major planets.<ref name="Deng2011">{{cite book|author=Yinke Deng|title=Ancient Chinese Inventions|url=https://books.google.com/books?id=EeVPT6UAk3EC&pg=PA68|date=March 3, 2011|publisher=Cambridge University Press|isbn=978-0-521-18692-6|page= 68}}</ref><ref>{{cite journal | last = Xi | first = Ze-zong | title = The Discovery of Jupiter's Satellite Made by Gan De 2000 Years Before Galileo | journal = [[Acta Astrophysica Sinica]] | volume = 1 | issue = 2 | pages = 87 | date = 1981 | bibcode = 1981AcApS...1...85X | url = http://en.cnki.com.cn/Article_en/CJFDTOTAL-TTWL198102000.htm | access-date = March 22, 2017 | archive-date = November 4, 2020 | archive-url = https://web.archive.org/web/20201104160900/http://en.cnki.com.cn/Article_en/CJFDTOTAL-TTWL198102000.htm | url-status = dead }}</ref>

On January 7, 1610, [[Galileo Galilei]] used a telescope to observe what he thought were three [[star]]s near Jupiter, including what turned out to be Ganymede, [[Callisto (moon)|Callisto]], and one body that turned out to be the combined light from [[Io (moon)|Io]] and [[Europa (moon)|Europa]]; the next night he noticed that they had moved. On January 13, he saw all four at once for the first time, but had seen each of the moons before this date at least once. By January 15, Galileo concluded that the stars were actually bodies orbiting [[Jupiter]].<ref name="SidereusNuncius" /><ref name="NASA" />{{efn|name=Marius}}