We define astronomy as “the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties” this is the word scientists use, and the word you would expect to see on the cover of your college textbook. In modern use the two words have quite different meanings, but for hundreds of years they were synonymous. Both words are quite old ( astronomy is from the 12th century, and astrology from the 14th), and both share a root with the word disaster (the Greek astron, meaning “star”).
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