The
Baily's beads effect is a feature of total
solar eclipses. As the
moon "grazes" by the
Sun during a
solar eclipse, the rugged
lunar limb topography allows beads of sunlight to shine through in some places, and not in others. The name is in honor of
Francis Baily who first provided an exact explanation of the phenomenon in 1836. The diamond ring effect is seen when only one bead is left; a shining diamond set in a bright ring around the lunar
silhouette.