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Baily's beads

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Baily's beads

Bright spots of sunlight seen around the edge of the Moon for a few seconds immediately before and after a total eclipse of the Sun, caused by sunlight shining between mountains at the Moon's edge. Sometimes one bead is much brighter than the others, producing the so-called diamond ring effect. The effect was described in 1836 by the English astronomer Francis Baily, a wealthy stockbroker who retired in 1825 to devote himself to astronomy.



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