Heliocentrism [a] is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Universe. Historically, heliocentrism was opposed to geocentrism , which placed the Earth at the center. The notion that the Earth revolves around the Sun had been proposed as early as the 3rd century BC by Aristarchus of Samos ,  but at least in the medieval world, Aristarchus' heliocentrism attracted little attention—possibly because of the loss of scientific works of the Hellenistic period. It was not until the 16th century that a mathematical model of a heliocentric system was presented , by the Renaissance mathematician, astronomer, and Catholic cleric Nicolaus Copernicus , leading to the Copernican Revolution. In the following century, Johannes Kepler introduced elliptical orbits , and Galileo Galilei presented supporting observations made using a telescope. With the observations of William Herschel , Friedrich Bessel , and other astronomers, it was realized that the Sun, while near the barycenter of the Solar System , was not at any center of the Universe.
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Using Italics or Quotation Marks in Titles
In: English and Literature. In this assessment, you will submit three 3 out of six 6 tutorial worksheets as part of a portfolio. You must submit worksheet 1 and then choose any two 2 from worksheet 2 to 6. The tutorial program has been designed to assist your learning and is directly linked to this assessment.
When To Italicize – The Rules You Need To Know
Last Updated: August 16, References Approved. This article was co-authored by Carrie Adkins, PhD. Carrie Adkins is part of the wikiHow team and works with writers and editors on research, sourcing, and content creation. She received numerous research and writing awards for her scholarship. There are 26 references cited in this article, which can be found at the bottom of the page.
Last Updated: October 8, References. This article was co-authored by Michelle Golden, PhD. Michelle Golden is an English teacher in Athens, Georgia.