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Why are the sun and moon the same size in the sky?

Why are the sun and moon the same size in the sky?

作者:瞿钦叽  时间:2019-03-14 08:02:00  人气:

By Marcus Chown (Image: Reverend Ronald Royer / SPL) (Image: Les Wilson / Rex Features) (Image: Sam Morgan Moore / Rex) (Image: Martin Rietze / WestEnd61 / Rex) (Image: Sipa Press / Rex) Read all the articles in our Unknown Solar System special It is one of the most glorious pieces of natural theatre. Assuming you spend your life on the same part of the Earth’s surface, you might witness it once – if you are particularly lucky or very long-lived, perhaps twice. But a total solar eclipse is worth the wait. At the height of totality, the fit of sun and moon is so perfect that beads of sunlight can only penetrate to us through the rugged valleys on the lunar surface, creating the stunning “diamond ring” effect. It is all thanks to a striking coincidence. The sun is about 400 times as wide as the moon,