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There are various claims made on Wikipedia about the discovery that planets move in elliptical orbits (whether geocentric or heliocentric ones).
This is claimed mostly for
I have no particular expertise in the case of Āryabhaṭa, but I will discuss the other two cases here.
For more details on much of this area, see also Talk:History_of_astronomy/Common_misconceptions put together by SteveMcCluskey (talk · contribs). I also use some material from his sandbox.