Between 1901 and 2100, NASA's catalog (Espenak) lists 2 to 5 solar and 2 to 4 lunar eclipses a year, 4 to 7 in all. They come in seasons: the Sun crosses the plane of the Moon's orbit about every 173 days, so there are two seasons a year, each with a solar and a lunar eclipse about two weeks apart. In 2026 there are four: an annular solar eclipse on February 17, a total lunar on March 3, a total solar on August 12 and a partial lunar on August 28.