Penumbra

Penumbra

The name given to the shadow cast by a celestial object that only blocks a portion of the light.

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Part of Speech: noun
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Blossary:
Industry/Domain: Astronomy
Category: Moon
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Related terms

penumbra

Astronomy; General astronomy

A partial shadow. The lighter, outer part of the shadow that is cast by the Moon onto the Earth during the solar eclipse.

penumbra

Astronomy; Moon

The name given to the shadow cast by a celestial object that only blocks a portion of the light.

penumbra

Chemistry; Weather; Atmospheric chemistry

Part of a sunspot. It is a large magnetic solar storm and the penumbra is the outer most ring of the storm composed of dark fibrils.

penumbra

Medical devices; Radiology equipment

The region at the edge of a treatment field, over which the absorbed dose rate changes rapidly as a function of the distance from the radiation beam axis. The penumbra is caused ...

penumbra

Earth science; Mapping science

That portion of a shadow in which light from an extended source is partially but not completely cut off by the intervening body. I.e., the region of partial shadow surrounding ...

penumbra

Language; Dictionaries

An incomplete or partial shadow.

crescent moon

Astronomy; Moon

The moon when it appears partly but less than one-half lit. It is seen between a new moon and a half moon.

gobbous moon

Astronomy; Moon

The Moon when it appears more than half lit but less than fully lit. It happens between full moon and half moon.

new moon

Astronomy; Moon

The Moon when it is not visible or when it is visible only as a thin crescent, is named as new moon.

moon

Astronomy; Moon

The round object that moves around the Earth at a distance of about 240,000 miles. Moon is one-fourth the size of the Earth.

S/2012 P 1

Astronomy; Moon

S/2012 P 1 is a small natural satellite of the planet Pluto. The moon was discovered on July 11, 2012. It is the fifth satellite of Pluto to be confirmed. The other four Pluto ...