Shape of Lunar Limb During a Solar Eclipse

November 03, 2005

Marked-limb

Provided by: Pete Lawrence
Summary authors & editors: Pete Lawrence

During a total solar eclipse or an annular eclipse, as the Moon covers the last sliver of the Sun, the solar photosphere, shining through lunar valleys, causes the effect referred to as "Bailey's beads." While analyzing images of the Baily's Beads phenomenon taken during the 3rd contact phase of last month's annular eclipse (October 3), it occurred to me that the images could be used to reveal the shape of the lunar limb at the contact point. A technique for extracting this information is explained at the link below. The results shown on the image above reveal remarkable concurrence with the predicted lunar profile. Photo taken from Madrid, Spain.

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