This will be the longest total solar eclipse between the dates of 4000 BC and at least AD 8000 (12,000 years), lasting a maximum of 7 minutes, 29 seconds. The factors that will make this such a long eclipse are:
The Earth being very near aphelion (furthest away from the Sun in its elliptical orbit, making its angular diameter nearly as small as possible). This occurs around July 6th.
The Moon being almost exactly at perigee (making its angular diameter as large as possible). The moment of greatest eclipse will be just 50 minutes after perigee.
The midpoint of the eclipse being very close to the Earth's equator, where the Earth's rotational velocity is greatest.
The midpoint of the eclipse being near the subsolar point (the part of the Earth closest to the Sun, and therefore also closest to the Moon during an eclipse).
The vector of the eclipse path at the midpoint of the eclipse aligning with the vector of the Earth's rotation (i.e. not diagonal but due east). For solar eclipses at the ascending node (odd numbered saros) this occurs approximately 12 days after the summer solstice.
The longest historical total eclipse lasted 7 minutes 28 seconds on June 15, 744BC.
The longest eclipse theoretically possible for the 3rd millennium is 7 minutes and 32 seconds.
It is a part of saros series 139, repeating every 18 years, 11 days, 8 hours, containing 71 events. The series started with partial solar eclipse on May 17, 1501. It contains hybrid eclipses on August 11, 1627 through December 9, 1825 and total eclipses from December 21, 1843 through March 26, 2601. The series ends at member 71 as a partial eclipse on July 3, 2763. Members in the same column are one exeligmos apart and thus occur in the same geographic area.
^Mark Littman; Fred Espenak; Ken Wilcox (2008). "A Quest to Understand". Totality: Eclipses of the Sun (3rd ed.). New York: Oxford University Press Inc. ISBN 0-19-953209-5. "Eclipse expert Jean Meeus calculates the maximum possible eclipse duration of totality in a solar eclipse is currently 7 minutes 32 seconds.
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