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Proper motion (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Proper motion" in Simple English language version.

refsWebsite
Global rank Simple English rank
1books.google.com
3rd place
2nd place

books.google.com

  • Theo Koupelis, Karl F. Kuhn (2007). In Quest of the Universe. Jones & Bartlett Publishers. p. 369. ISBN 978-0763743871.