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 Venus at the time of internal contact with the 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 telescope.
End of Article: BLACK DROP
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