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Phases of the Moon and Venus

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Uploaded by on Dec 30, 2008

Just as our Moon goes through a full set of phases, so do the two inner planets, Venus and Mercury. With Venus, they're pretty easy to observe through a telescope. Galileo was able to view them nearly 400 years ago, and those observations helped to disprove the geocentric model of the solar system. Here, we use diagrams of the orbits of the inner solar system to show why Venus exhibits these changes, as well as pictures and video of the Moon and Venus in roughly the same phase.

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Science & Technology

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Uploader Comments (TheStarWatchingRock)

  • .. and mars

  • Venus was a very thin crescent in the morning sky just before sunrise last month. It is still a crescent, but it's phase is growing. Mars, being 60 million km more distant from the Sun than Earth, never appears as a crescent. The two planets appear next to each other in the morning sky now, about 90 minutes before sunrise.

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  • Can someone tell me the next time the phase of venus transitions to a thin crescent shape? Thanks in advance.

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