![]() The local circumstances at the observer's position can then be calculated including the eclipse contact times, eclipse magnitude and the duration of totality (or annularity). Next, the shadow cone is projected onto Earth's surface including the effects of Earth's rotation, the flattening of Earth and the latitude, longitude and elevation of the observer. This plane passes through the center of Earth and is oriented perpendicular to the Moon's shadow axis. They describe the movement of the Moon's shadow with respect to the fundamental plane. ![]() It is similar to the penumbra in that the Sun is only partially blocked by the Moon.įrom within the antumbra, the Sun appears larger than the Moon which is seen in complete silhouette.Īn annular eclipse is seen when an observer passes through the antumbra.īesselian elements - The Besselian elements are a series of time dependent variables used to calculate various aspects of a solar eclipse. The antumbra is that part of the Moon's shadow that extends beyond the umbra. It can last from a fraction of a second to a maximum of 12 minutes 29 seconds. The maximum phase of an annular eclipse during which the Moon's entire disk is seen silhouetted against the Sun.Īnnularity is the period between second and third contact during an annular eclipse. Glossary of Solar Eclipse Terms Fred EspenakĪ solar eclipse in which the Moon's antumbral shadow traverses Earth (the Moon is too far from Earth to completely cover the Sun).ĭuring the maximum phase of an annular eclipse, the Sun appears as a blindingly bright ring surrounding the Moon.
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