Editing Earth's orbit (section)

==History of study==
{{Main|Heliocentrism}}

[[Image:Heliocentric.jpg|thumb|Heliocentric Solar System]]
[[Image:geoz wb en.svg|thumb|Heliocentrism (lower panel) in comparison to the geocentric model (upper panel), not to scale]]

[[Heliocentrism]] is the scientific model that first placed the Sun at the center of the [[Solar System]] and put the planets, including Earth, in its orbit. Historically, heliocentrism is opposed to [[geocentrism]], which placed the Earth at the center. [[Aristarchus of Samos]] already proposed a heliocentric model in the third century BC. In the sixteenth century, [[Nicolaus Copernicus]]' ''[[De revolutionibus]]'' presented a full discussion of a [[Copernican heliocentrism|heliocentric model]] of the universe <ref>{{Cite book|title = De revolutionibus orbium coelestium|publisher = Johannes Petreius|date = 1543}}</ref> in much the same way as [[Ptolemy]] had presented his geocentric model in the second century. This "[[Copernican Revolution]]" resolved the issue of planetary [[apparent retrograde motion|retrograde motion]] by arguing that such motion was only perceived and apparent. According to historian [[Jerry Brotton]], "Although Copernicus's groundbreaking book ... had been [printed more than] a century earlier, [the Dutch mapmaker] [[Joan Blaeu]] was the first mapmaker to incorporate his revolutionary heliocentric theory into a map of the world."<ref>[[Jerry Brotton]], ''A History of the World in Twelve Maps'', London: Allen Lane, 2012, {{ISBN|9781846140990}} p. 262.</ref>