third contact

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In a total solar eclipse, the moment when the trailing (western) limb of the Moon coincides with the Sun's western limb, at which time totality ends; or, in a total lunar eclipse, the point when the Moon's leading limb reaches the eastern edge of the Earth's umbra, ending totality. Immediately after third contact in a solar eclipse, the diamond ring or Baily's beads may become visible. At an annular eclipse, third contact refers to the instant when the Moon's leading (eastern) limb leaves the Sun's eastern limb, and the annular phase ends.

Subjects: Astronomy and Astrophysics.

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