Astronomical Dictionary on Letter #C

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Celestial Equator

The projection of the Earth's equator upon the celestial sphere. Right ascension is the longitude me...

Celestial Equator

Celestial Sphere

The projection of space onto the night sky, an imaginary hollow sphere of infinite radius surroundin...

Celestial Sphere

Celestial Poles

The projection of the Earth's poles onto the celestial sphere. One of two points about which the Cel...

Celestial Poles

Chromosphere

The layer between the photosphere and the corona in the atmosphere of the Sun, or any other star, ma...

Chromosphere

Coma

(1) The luminous structure surrounding the head (solid portion) of a comet. (2) A defect in an opt...

Coma

Comet

An icy object in independent orbit about the Sun; smaller than a planet, usually having a highly ell...

Comet

Conjunction

When two bodies appear to close together in the sky, i.e. they have the same Right Ascension. Mercur...

Conjunction

Constellation

An arbitrary grouping of stars which form a pattern. The 12 zodiacal constellations, Orion, the Big ...

Constellation

Corona

The outer layer, and hottest part, of the Sun's atmosphere; also the halo appearing around the black...

Corona

Coronagraph

A special telescope which blocks light from the Sun's disc, thus creating an artificial eclipse, in ...

Coronagraph

Cosmic Ray

An extremely fast, energetic and relativistic (high speed) charged particle. ...

Cosmic Ray

Cosmos

The Universe: the word is derived from the Greek, meaning 'everything'. ...

Cosmos

Culmination

A general term for the hightest and lowest points a planet or celestial body reaches in the sky rela...

Culmination

Culmination

A general term for the hightest and lowest points a planet or celestial body reaches in the sky rela...

Culmination

Cuspate

Shaped like a cusp; a sharp projection of material....

Cuspate

Crust

The outermost layer of the lithosphere....

Crust

Crater

An approximately circular depression, sometimes surrounded by a raised rim. Craters are typically fo...

Crater

Chondrite

A stony meteorite, composed of finely crystallized material....

Chondrite

Chasma

A large canyon....

Chasma

Charon

In Greek mythology, ferryman of the River Styx, who carried the dead to the underworld. Each dead pe...

Charon

Cerberus

In Greek mythology, the three-headed dog that guards the entrance to the underworld....

Cerberus

Centaur

In Greek mythology, a being with the head, arms, and torso of a man, and the body and legs of a hors...

Centaur

Cassini

Gian Domenico Cassini (1625-1712) Astronomer born in Italy, later a naturalized French citizen. Disc...

Cassini

Carson

Rachel Carson (1907-1964) American biologist and author....

Carson

Candor

Candor Chasma - from the Latin candor, meaning "blaze" or "the white" from its appearance....

Candor

Callisto

In Greek mythology, a nymph, follower of Artemis. Zeus wanted to woo her, and so disguised himself a...

Callisto

Caldera

A large volcanic depression at the summit of a volcano, caused by collapse or explosion....

Caldera
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