Astronomical Dictionary

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Absolute Magnitude

The apparent magnitude that a star would possess it if were placed at a distance of 10 parsecs from ...

Absolute Magnitude

Accretion

An accumulation of dust and gas into larger bodies such as stars, planets and moons, or as discs aro...

Accretion

Albedo

The total ratio of sunlight reflected by a planet or body compared to what it receives from the S...

Albedo

Aphelion

The point in the orbit of a planet or comet when it is furthest from the center of the Sun. (Opposi...

Aphelion

Apogee

Similar to aphelion. The point in the orbit of the moon furthest from the center of the earth. (oppo...

Apogee

Apoapsis

The point in an orbit when a planet is farthest from any body other than the Sun or the Earth. ...

Apoapsis

Arc Minute

A measure of angular separation. Arc is measured in a number of different units designed for various...

Arc Minute

Asteroid

(Also "planetoid") These are rocky bodies, the vast majority of which orbit the Sun between Mars and...

Asteroid

Ascending Node

The point in the orbit of an object, when it crosses the ecliptic, (or celestial equator) whilst mov...

Ascending Node

Astronomical Unit

A system of measurement used within our solar system based on the mean distance between the Earth an...

Astronomical Unit

Aurora

The Northern Lights. The brilliant displays of colored light in the sky at extreme northern and sout...

Aurora

Binary Star

A double star; most commonly, a physical binary, or two stars which revolve about a common center of...

Binary Star

Blue Moon

The second full moon in a calendar month, or the third full moon in a season containing four....

Blue Moon

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

Astronomical terms by letter:

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