For total eclipses, the instant of greatest eclipse is nearly identical to the instant of greatest duration. This time corresponds to the instant when the axis of the Moon’s shadow passes closest to Earth’s center. Solar Eclipse Datesīy convention, the date and time used to identify a solar eclipse is the instant of greatest eclipse. Three Types of Solar Eclipses: Partial, Total, and Annular. For more information, see Periodicity of Solar Eclipses. The recurrence of solar eclipses is governed by the Saros cycle. However, one edge of the umbra or antumbra grazes Earth thereby producing a ground track with one limit and no central line.
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