Solar Eclipse Contacts

Similar definitions to the above are used for defining the contact points during a solar eclipse, although the repeat usage of some of the alphanumeric terms can cause some confusion. P1 is when the partial solar eclipse begins, the lunar limb first appearing to touch the disk of the Sun, and similarly P2 is when the Moon wholly departs. For a total eclipse, U1 is defined as the instant at which totality begins, and U2 when it ends, the two being separated by merely a few minutes. For an annular eclipse, U1 is when the Moon is first completely enveloped within the solar disk, U2 when it touches the opposite solar limb.

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