Do astronomers have to memorize every point of light in the sky?

Do astronomers have to memorize every point of light in the sky?
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Answer :

No. There are too many. I’m not an astronomer, but Hubby is. I have read some articles in his magazines that mention them by numbers or some such. Maybe those are only known by their locations in the sky. . But they do know the locations and names of many as well.
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