by Daniel Giamario
When determined by length (six minutes 39 seconds) and centrality (the umbra only 275 miles north of the center of the earth) the total solar eclipse of July 21 through July 22 is rightly called the Solar Eclipse of the Century. None will surpass it until 2114. This solar eclipse is part of Saros Cycle 136 that has produced the longest eclipses over the last several hundred years. The term Saros refers to a “family” of eclipses that repeat about every 18 years and 11 days. This particular Saros began in June of 1360 and finishes up in July of 2622, a total of 71 eclipses over 1262 years. This Saros cycle gave us the longest total solar eclipses of the last century, including the only three eclipses over seven minutes long in 1937, 1955 and 1973. Every eclipse in this family from 1901 until 2063 is over six minutes, a length justifying the title “Great Eclipse”. Read More