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Last Post 3/20/2013 5:56 AM by  Terry Kucera
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3/20/2013 4:54 AM

    What would it be called if another planet passed between the sun and the Earth, similar to when the moon passes between the sun and the Earth?


    Tags: eclipse

    Terry Kucera

    Basic Member

    Basic Member

    3/20/2013 5:56 AM


    When one object passes in front of another and appears smaller than the object in the background it is called a transit. One recent example is last year's transit of Venus across the Sun (see Venus transits of the Sun are quite rare, with less than two every century.

    One unusual transit was a transit of the moon by the Sun seen from the point of veiw of the spacecraft STEREO-B in 2007. STEREO-B was leaving Earth orbit and further away from the moon than Earth is. As a result the moon appeared smaller than the Sun An image of this transit across the Sun seen in the ultraviolet can be seen here:

    From Earth the Sun's disk and Moon appear to be the same size resulting in our unusual and beautiful total eclipses.



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