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    Re: Mars - Mercury Question
    From: Don Seltzer
    Date: 2013 Feb 3, 09:45 -0800

    Alex wrote:

    > If the orbital period of Mercury is 88 days, does it not move (360/88)

    No. Because it does not make the full circle (360d) around the sky,
    like the Moon does. It moves on a small elongated ellipse around the Sun,
    and the size of this ellipse is between 17 to 27 degrees.

    And the periods in which Mercury appears to be moving fastest across the sky are when it is in conjunction, and thus not visible from Earth.

    Don Seltzer
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