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The eclipse of the moon when the moon passes only through the penumbra of the earth’s shadow.

Related Terms

GROUP FLASHING LIGHT

A flashing light in which the flashes are combined in groups, each group having the same number of flashes, and in which the groups are repeated at regular intervals. The eclipses separating the flashes within each group are of equal duration and this duration is clearly shorter than the duration of the eclipse between two successive groups.

LUNAR ECLIPSE

An eclipse of the moon. When the moon enters the shadow of the earth, it appears eclipsed to an observer on the earth. A lunar eclipse is penumbral when it enters only the penumbra of the earth’s shadow, partial when part of its surface enters the umbra of the earth’s shadow, and total if its entire surface is obscured by the umbra.

ANNULAR ECLIPSE

An eclipse in which a thin ring of the source of light appears around the obscuring body. Annular solar eclipses occur, but never annular lunar eclipses.

APPULSE

1. The near approach of one celestial body to another on the celestial sphere, as in occultation, conjunction, etc. 2. The penumbral eclipse of the moon.

ECLIPSE

1. Obscuring of a source of light by the intervention of an object. When the moon passes between the earth and the sun, casting a shadow on the earth, a solar eclipse takes place within the shadow. When the moo

PARTIAL ECLIPSE

An eclipse in which only part of the source of light is obscured.

SAROS

A period of 223 synodic months corresponding approximately to 19 eclipse years or 18.03 Julian years, and is a cycle in which solar and lunar eclipses repeat themselves under approximately the same conditions.

TOTAL ECLIPSE

An eclipse in which the entire source of light is obscured.

LUNAR ECLIPSE

An eclipse of the moon. When the moon enters the shadow of the earth, it appears eclipsed to an observer on the earth. A lunar eclipse is penumbral when it enters only the penumbra of the earth’s shadow, partial when part of its surface enters the umbra of the earth’s shadow, and total if its entire surface is obscured by the umbra.

PENUMBRA

1. That part of a shadow in which light is partly cut off by an intervening object. The penumbra surrounds the darker UMBRA in which light is completely cut off. 2. The lighter part of a sun spot, surrounding the darker UMBRA.

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