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Eclipse of the Sun. S=Sun, E=Earth, M=Moon

Eclipse of the Sun

Eclipse of the Sun. S=Sun, E=Earth, M=Moon

"Umbra and Penumbra. A solar eclipse, with the penumbra, d, c, and the umbra or dark shadow is seen here. When the Moon is at its greatest distance from the Earth, its shadow m o, sometimes terminates, before it reaches the Earth, and then an observer standing directly under the point o, will see the outer edge of the Sun, forming a bright ring around the circumference of the Moon, thus forming an annular eclipse." —Comstock, 1850

Umbra

"Umbra and Penumbra. A solar eclipse, with the penumbra, d, c, and the umbra or dark shadow is seen…