an expert in astronomy; a scientific observer of the celestial bodies.

1325–75; Middle English; see astronomy, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
astronomer (əˈstrɒnəmə)
a scientist who studies astronomy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., from astronomy (q.v.), replacing Fr. import astronomyen (c.1300), which, had it survived, probably would have yielded *astronomian. Still in Shakespeare used in places where we would write astrologer.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Before and after the accident, the astronomer demands to be the sun in her
  domestic solar system.
The astronomer said that expressing the color for popular viewing was not even
  part of the original scientific experiment.
He always joked that he had become an astronomer by marrying one.
The non-astronomer should have an idea of the benefits that such a telescope
  could bring.
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