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bailys bead

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Baily's beads

[bey-leez]
–plural noun
spots of light that appear to encircle the moon, resembling a string of luminous beads, visible immediately before and after a total eclipse, caused by the sun's light shining between the mountains on the moon's surface.


Origin:
named after Francis Baily (1774–1844), English astronomer who first described them
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
Baily's beads   (bā'lēz)  Pronunciation Key 
A discontinuous, beadlike pattern of sunlight visible along the edge of the darkened Moon's disk in the seconds before and after totality during a full solar eclipse. The pattern is caused by light shining through the uneven lunar topography silhouetted along the curved edges of the disk. Baily's beads are named after British astronomer Francis Baily (1774-1844), who first observed them in 1836.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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