For Johannes Kepler German mathematician and astronomer.
"kepler-s-laws." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/kepler-s-laws>.
kepler-s-laws. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/kepler-s-laws
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