The Epicycle Model of Bhaskara
The Model propounded by Aryabhata is an algorithm. The Khmers drew the diagrams of the Sun by using the epicyle equivalent of the model developed by Bhaskara in the seventh century. Eccentricity is variable in this Epicycle Model.
You can see a relevant animation of Dennis Duke at
http://people.scs.fsu.edu/~dduke/pingree2.html
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