diamond-ring effect

diamond-ring effect

A bright flash of sunlight from a conspicuous Baily's bead sometimes very briefly observed, together with the solar chromosphere, at the Moon's limb just before or after totality during a solar eclipse.

diamond-ring effect

[¦dī·mənd ′riŋ i‚fekt]
(astronomy)
A phenomenon observed just before and after the central phase of a total solar eclipse, in which the last Baily's bead glows brightly compared with other visible features, and the solar corona forms a band that is visible on the rest of the lunar edge.
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Next, the dazzling diamond-ring effect, as the last ray of sunlight shone through a valley on the Moon's surface, contrasting the lunar jewel with the still-faint solar corona forming the ring's band.