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Definition of astronomer : 1. An astrologer.
2. One who is versed in astronomy; one who has a knowledge of the laws of the heavenly orbs, or the principles by which their motions are regulated, with their various phenomena.

Synonyms:

chaos, astronomical unit, astrophysicist, astrophotographer, astrochemist, stargazer, observatory, lotus-eater, astronomy, cosmology, scientist, the Big Bang, radio telescope, uranologist, uranographer, astrophotometrist, cosmologist, astronomical telescope

Usage examples:

• In truth, I should say that the various disadvantages due to the atmosphere deprive the astronomer of at least one- half of the available light- collecting power of his telescope, and consequently of the defining power of the eye- piece; that with a 200 glass he sees less than a power of 100 reveals to an eye situated in space; though, from the nature of the lens through which I looked, I cannot speak with certainty upon this point. - "Across the Zodiac", Percy Greg.
• So the Astronomer- Royal thought on reading Leverrier's paper. - "Pioneers of Science", Oliver Lodge.
• When he was appointed to the post of Astronomer Royal, he stipulated that he should not be asked to vote in any political election. - "Autobiography of Sir George Biddell Airy", George Biddell Airy.