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    Astronomy Constellations
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Astronomy Site Archive

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    Astronomy Definitions and Factiods

     

    Astronomy Definitions 3

     

    Magnitude

    A measure of the faintness of a star. Magnitude 6.0 is the faintest we can ordinarily see, and the average of the twenty brightest stars defines magnitude 1.0. Each magnitude step is a factor of 2.5 in brightness.

    Meridian

    An observer's meridian passes through his zenith at the celestial poles. It is his north-south line. Meteor A flash of light produced by a particle in the atmosphere moving so rapidly that it becomes luminous.

    Meteorite

    A rock that once looked like a meteor. Morning Sky That half of the celestial sphere containing the sun.

     


     

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