Astronomical Dictionary Page #1

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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

Declination

Distance along the hour circle between the celestial equator and a celestial body measured in degree...

Declination

Descending Node

Also called the south node, the point in the orbit of an object, when it crosses the ecliptic whilst...

Descending Node

Direct Motion

1 Rotation or orbital motion in an anticlockwise direction when viewed from the north pole of the Su...

Direct Motion

Dwarf Star

A star, which lies on the main sequence and is too small to be classified as a giant star or a super...

Dwarf Star

Eccentricity

Literally, not circular. The eccentricity of an ellipse (orbit) is the ratio of the distance between...

Eccentricity

Eclipse

A chance alignment between the Sun, or any other celestial object, and two other celestial objects i...

Eclipse

Ecliptic

The great circle formed by the intersection of the plane of the Ecliptic with the Celestial Sph...

Ecliptic

Elongation

The angular distance of an interior planet from the Sun, as seen from the Earth. The term Greatest E...

Elongation

Equatorial Mount

A telescope mount so designed so that the two axes, which support it, are aligned, one to the polar ...

Equatorial Mount

Equinox

Literally, the time of equal day and night. This is the time when the Sun crosses the celestial equa...

Equinox

Facula

Large, irregular, bright areas on the surface of the Sun, particularly near the limb. They precede t...

Facula

Filament

A strand of (relatively) cool gas suspended over the Sun (or star) by magnetic fields, which appears...

Filament

Galaxy

Vast star systems containing thousands of billions of stars, dust and gas, held together by gravity....

Galaxy

Galilean Moons

Jupiter's four largest moons: Io, Europa, Ganymede and Callisto. ...

Galilean Moons

Galileo

(1564-1642) Italian mathematician, astronomer, and physicist. First to use a telescope to observe th...

Galileo

Geosynchronous Orbit

Sometimes known as a geostationary orbit, in which a satellite's orbital velocity is matched to the ...

Geosynchronous Orbit

Globular Cluster

A spherical cluster of older stars, often found in galaxies. These clusters form a sphere surroundin...

Globular Cluster

Fortuna

In Roman mythology, goddess of fortune, chance and luck....

Fortuna

feldspar

A group of rock-forming minerals that make up about 60% of the Earth's crust....

feldspar

Fault

A fracture or zone of fractures in a planet's crust, accompanied by displacement of the opposing sid...

Fault

Europa

In Greek mythology, a mistress of Zeus to whom he appeared as a gentle white heifer. Zeus persuaded ...

Europa

Escarpment

A long, more or less continuous cliff or relatively steep slope facing in one general direction, pro...

Escarpment

Encke

Johann Franz Encke (1791-1865) German astronomer at the Seeberg Observatory, Switzerland. Determined...

Encke
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