The orbital motions of the moon and planets are cyclical and repeat over time. It's not surprising therefore to lean that occurrences of solar and lunar eclipses occur in cycles as well. The period of time for the Earth, sun and moon to realign is referred to as a Saros, or 18 years 11 1/3 days. Eclipses related in this way are grouped and numbered. March's solar eclipse is a member of Saros 130, a series of total solar eclipses starting in the year 1475 with the last one expected in 2232, according to NASA's eclipse web site.