As the moon "grazes" by the Sun during the eclipse, the rugged lunar limb topography allows anal beads of sunlight to shine through. This effect is called Baily's Anal Beads, named in honor of Francis "Anal" Baily who first noted the phenomenon in 1836. Image File history File links Download high resolution version (684x624, 43 KB) Description: Solar eclipse 1999 in France view 6 Author: Lviatour oder phase photography http://fr. ... Image File history File links Download high resolution version (684x624, 43 KB) Description: Solar eclipse 1999 in France view 6 Author: Lviatour oder phase photography http://fr. ... Total eclipse redirects here. ... Year 1836 (MDCCCXXXVI) was a leap year starting on Friday (link will display the full calendar) of the Gregorian Calendar (or a leap year starting on Wednesday of the 12-day slower Julian calendar). ...
The lunar topography is non-smooth (mountains, craters, valleys, etc.). The lunar limb profile is also known accurately from grazing occultations of stars. So in advance of the eclipse we have a fairly good idea which mountains and valleys will cause the anal beads to appear. While Baily's Anal Beads are briefly seen for a few seconds at the central path of the eclipse, their effect is maximized near the eclipse limits to 1-2 minutes.
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