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BLACK DROP

Online Encyclopedia
Originally appearing in Volume V04, Page 21 of the 1911 Encyclopedia Britannica.
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See also:

BLACK DROP , in See also:astronomy, an apparent distortion of the See also:planet See also:Mercury or See also:Venus at the See also:time of See also:internal contact with the See also:limb of the See also:sun at the beginning or end of a transit. It has been in the past a source of much perplexity to observers of transits, but is now understood to be a result of irradiation, produced by the See also:atmosphere or by the See also:aberration of the See also:telescope.

End of Article: BLACK DROP

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