One of the stellar patterns identified by name, usually of mythological gods, people, animals, or objects. Also, the region of the sky containing that star pattern.

A named grouping of stars that is not one of the recognized constellations.

The astronomical brightness scale. The larger the number the fainter the star.

Apparent visual magnitude (m, v)

A measure of the brightness of a star as seen by human eyes on Earth.

A measure of the flow of energy out of a surface. Usually applied to light.

An imaginary sphere of very large radius surrounding Earth to which the planets, stars, Sun, and Moon seem to be attached.

A concept that helps you think about some aspect of nature without necessarily being true.

The slow change in orientation of the earth's axis of rotation. Once cycle takes nearly 26 000 years.

Motion around an axis passing through the rotating body.

Orbital motion about a point located outside the orbiting body.

The apparent path of the Sun around the sky.

The even that occurs when the Moon passes directly between Earth and the Sun, blocking your view of the Sun.

The region of a shadow that is totally shaded.

The portion of a shadow that is only partially shaded.

A solar eclipse in which the solar photosphere appears around the edge of the Moon in a bright ring, or annulus. Features of the solar atmosphere cannot be seen during an annual eclipse.

The darkening of the Moon when it moves through Earth's shadow.

An 18-year, 11 1/3 day period after which the pattern of lunar and solar eclipses repeats.

The angular distance of an object on the celestial sphere measure north (+) or south (-) from the celestial equator.

The angular east-west distance of an object on the celestial sphere measure from the vernal equinox; measured in hours, minutes, and seconds rather than angular degrees.

The average time between successive crossings of the Sun on the local meridian (24 hours).

The time between successive crossings of any star on the local meridian (23 hours, 56 minutes, 4.09 seconds).

The time for a complete cycle of lunar phases (about 29.5 days).

The time for the Moon to orbit Earth once relative to any star (~27.3 days).

The time for Earth to complete one full orbit around the Sun relative to any star.

Tropical year (solar year)

The time between successive spring (or autumnal) equinoxes.

Time measured by the location of the Sun in the local sky such that noon is when the Sun crosses the meridian.

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Astronomy 1021

Ch. 2

Question	Answer
Constellation	One of the stellar patterns identified by name, usually of mythological gods, people, animals, or objects. Also, the region of the sky containing that star pattern.
Asterism	A named grouping of stars that is not one of the recognized constellations.
Magnitude scale	The astronomical brightness scale. The larger the number the fainter the star.
Apparent visual magnitude (m, v)	A measure of the brightness of a star as seen by human eyes on Earth.
Flux	A measure of the flow of energy out of a surface. Usually applied to light.
Celestial sphere	An imaginary sphere of very large radius surrounding Earth to which the planets, stars, Sun, and Moon seem to be attached.
Scientific model	A concept that helps you think about some aspect of nature without necessarily being true.
Precession	The slow change in orientation of the earth's axis of rotation. Once cycle takes nearly 26 000 years.
Rotation	Motion around an axis passing through the rotating body.
Revolution	Orbital motion about a point located outside the orbiting body.
Ecliptic	The apparent path of the Sun around the sky.
Solar eclipse	The even that occurs when the Moon passes directly between Earth and the Sun, blocking your view of the Sun.
Umbra	The region of a shadow that is totally shaded.
Penumbra	The portion of a shadow that is only partially shaded.
Annual eclipse	A solar eclipse in which the solar photosphere appears around the edge of the Moon in a bright ring, or annulus. Features of the solar atmosphere cannot be seen during an annual eclipse.
Lunar eclipse	The darkening of the Moon when it moves through Earth's shadow.
Saros cycle	An 18-year, 11 1/3 day period after which the pattern of lunar and solar eclipses repeats.
Declination	The angular distance of an object on the celestial sphere measure north (+) or south (-) from the celestial equator.
Right ascension	The angular east-west distance of an object on the celestial sphere measure from the vernal equinox; measured in hours, minutes, and seconds rather than angular degrees.
Solar day	The average time between successive crossings of the Sun on the local meridian (24 hours).
Sidereal day	The time between successive crossings of any star on the local meridian (23 hours, 56 minutes, 4.09 seconds).
Synodic month	The time for a complete cycle of lunar phases (about 29.5 days).
Sidereal month	The time for the Moon to orbit Earth once relative to any star (~27.3 days).
Sidereal year	The time for Earth to complete one full orbit around the Sun relative to any star.
Tropical year (solar year)	The time between successive spring (or autumnal) equinoxes.
Apparent solar time	Time measured by the location of the Sun in the local sky such that noon is when the Sun crosses the meridian.

Created by: schris48

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