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First to state the conclusion it is very good. I should be considered a beginner in visual observation. I have observed some Messier and NGC objects of course the total number is currently less than 100 which is related to the infrequent outings and unfamiliarity with optical systems. 21-24 years Observed distant celestial bodies in various environments In 2021 I observed over 40 deep ...
https://www.zhihu.com/en/answer/100210170839
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