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... rological analysis, which two days of the month are the best weather, then the party will be held with a temporary notice.
For example, if you want to observe the Messier objects in autumn, you have to find a good day in September; if you want to observe the moon, you have to find a clear and full moon day. In short, this party has high requirements on the weather and time. The variables are large.
But astronomy enthusiasts are very fanatical, they will pay attention to relevant in ...
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