Online Encyclopedia

BLACK DROP

Online Encyclopedia
Originally appearing in Volume V04, Page 21 of the 1911 Encyclopedia Britannica.
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BLACK DROP  , in astronomy, an apparent distortion of the planet Mercury or
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Venus at the time of
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internal contact with the
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limb of the 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 atmosphere or by the aberration of the
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telescope .

End of Article: BLACK DROP
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