5.1 Visual sequence of two particular eclipse seasonsĪn eclipse season is the only time when the Sun (from the perspective of the Earth) is close enough to one of the Moon's nodes to allow an eclipse to occur.

4.1 Visual sequence of two particular eclipse seasons.

3.1 Visual sequence of two particular eclipse seasons.

2.2 15-year chart of eclipses (2004–2018) demonstrating seasons.

2.1 Visual sequence of two particular eclipse seasons.

A lunar eclipse would occur at every full moon, a solar eclipse every new moon, and all solar eclipses would be the same type.

If the Earth had a perfectly circular orbit centered around the Sun, and the Moon's orbit was also perfectly circular and centered around the Earth, and both orbits were coplanar (on the same plane) with each other, then two eclipses would happen every lunar month (29.53 days). These distances vary because both the Earth and the Moon have elliptic orbits. The type of each solar eclipse (whether total or annular, as seen from the sublunar point) depends on the apparent sizes of the Sun and Moon, which are functions of the distances of Earth from the Sun and of the Moon from Earth, respectively, as seen from Earth's surface. During the eclipse season, the declination of the Moon's orbit is low, hence the Sun, Moon, and Earth become aligned straight enough (in syzygy) for an eclipse to occur.Įclipse seasons should occur 38 times within a saros period (6585.3 days). Either two or three eclipses happen each eclipse season.

Each season lasts about 35 days and repeats just short of six months later, thus two full eclipse seasons always occur each year. An eclipse season is one of only two periods during each year when eclipses can occur, due to the variation in the declination of the Moon.

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