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 Greatest eclipse is defined as the instant when the axis of the Moon's shadow passes closest to the Earth's center.
For total eclipses, the instant of greatest eclipse is virtually identical to the instants of greatest magnitude and greatest duration.
The largest uncertainty in the eclipse predictions is caused by fluctuations in Earth's rotation due primarily to tidal friction of the Moon.
The resultant drift in apparent clock time is expressed as ΔT and is determined as follows: A series of polynomial expressions have been derived to simplify the evaluation of ΔT for any time from -1999 to 3000.
Consequently, the Moon's shadows miss Earth at most New Moon's.Nevertheless, there are 2 to 5 solar eclipses every calendar year.There are four types of solar eclipses: partial, annular, total and hybrid.She previously served as the editor of a community magazine in Southern California and was also an active real-estate agent, specializing in commercial and residential properties.She has a Bachelor of Arts in communications from California State University, Fullerton.