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Michael Efroimsky (Russian: Михаил Эфроимский) is an American astronomer of Russian origin. His research interests are in celestial mechanics and relativity. He is working as a Research Scientist at the US Naval Observatory in Washington DC.
In 2008 - 2009, he served as the Chair of the Division on Dynamical Astronomy of the AAS.
With Benoit Noyelles, Julien Frouard and Valeri V. Makarov, Michael Efroimsky co-authored a theory  explaining the origin of the present state of rotation of the planet Mercury, a so-called 3:2 spin-orbit resonance.
- Kopeikin, S.; Efroimsky M. & Kaplan G. (2011). Relativistic Celestial Mechanics of the Solar System. Wiley-VCH, Berlin. ISBN 978-3-527-40856-6.
- Noyelles, Benoit; Frouard, Julien; Makarov, Valeri V.; Efroimsky, Michael (October 2014). "Spin-orbit evolution of Mercury revisited". Icarus. 241: 26 – 44. arXiv: . Bibcode:2014Icar..241...26N. doi:10.1016/j.icarus.2014.05.045. Retrieved 19 March 2017.
- "Michael Efroimsky citations". Google Scholar. Retrieved 2017-03-19.
- Pepe, Alberto; Kurtz, Michael J. (November 2012). "A Measure of Total Research Impact Independent of Time and Discipline". PLoS ONE. 7 (11). arXiv: . Bibcode:2012PLoSO...746428P. doi:10.1371/journal.pone.0046428. e46428. Retrieved 19 March 2017.
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