Baily's beads or pearls of light — Astronoo

On May 15, 1836, Francis Baily observed "Baily's Beads" during the annular solar eclipse of that year. From the article:

"Baily's beads
Baily's beads or pearls of light
Updated November 10, 2013

The Baily's beads are visible not on a lunar eclipse, but during an eclipse of the Sun by the Moon.
During an annular eclipse of the sun can observe this phenomenon called Baily's beads. This is due to the topography of the surface of the moon (presence of mountains, craters, valleys, ...).
It has been described vividly by Francis Baily who noted this phenomenon in 1836. These abrasions of the Moon sunlight during a solar eclipse, allows beads of sunlight to shine through places and disappear in others. As we know perfectly irregularities lunar profile, astronomers can calculate in advance the appearance of beads on the circle of the eclipse.
Baily's beads appear briefly for a few seconds on the path of light around the edges and their duration is 1 to 2 minutes. A Flash Red appears just after the vision of Baily's beads. This short passage has the effect to bright pink color, the solar corona.
The red color is due to the hydrogen alpha line radiating at this wavelength.
The diamond ring or diamond Airy is the last portion of the sun silhouetted behind the black disk of the moon. At this point, this image looks like a ring with a diamond shining its thousand lights. It takes place just before or after the eclipse."