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WAITING FOR THE
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SOLAR AND LUNAR ECLIPSE OBSERVINGHOME PAGE |
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  ECLIPSE DAY*   |
    Source: http://aa.usno.navy.mil/data/docs/RS_OneDay.php Civil twilight is defined as occurring when the Sun is 12o or more but less than 18o below the ideal horizon. In Canberra’s mid-latitudes, this presents as a patch of brighter cyan coloured sky being visible in the suns direction while the opposite side of the sky goes a darker blue but not black. In clear arctic skies, skies can be darker for a given solar altitude than polluted mid-latitudes. |