what is the criterion of visibility
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CRITERION OF VISIBILITY
- For any object with sufficient size to be visible in the sky, there must be sufficient contrast between the object and the surrounding background . Contrast is defined as the ratio of the object's (Moon's in this case) illumination to the sky's brightness.
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the quality or state of being visible. 2a : the degree of clearness (as of the atmosphere or ocean) specifically : the greatest distance through the atmosphere toward the horizon at which prominent objects can be identified with the naked eye. b : capability of being readily noticed.
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