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What is the diameter of a circular mare? Is there twilight and dawn on the moon?

April 26, 2017Astronomy circular diameter mare Mathematics moon Twilight

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What is the diameter of a circular mare? Is there twilight and dawn on the moon?

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The word “mare”, pronounced “mar-ray” is Latin, and means sea, because that’s what observers once thought they were. There is dawn on the moon, but not twilight, as this is caused by the scattering of the suns light by atmosphere, which the moon doesn’t have.