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Astronomy Vocab

Vocabulary for Astronomy

TermDefinition
Astronomy The scientific study of the universe; It celestial bodies and phenomena
Geocentric Describes the concept of an Earth's central universe.
Heliocentric Describes the view that the sun is the center of the solar system
Retrograde Motion The apparent westward motion of the planet with respect to the stars
Ellipse An oval
Astronomical Unit Average distance from Earth to Sun, 150 million kilometers
Rotation The spinning of a body such as Earth about its axis
Revolution The motion of one body about another as Earth about the Sun.
Procession A change in the orientation of the rotational axis of a rotating body
Perihelion The point in the orbit of a planet where it is closest to the sun
Aphelion The place in the orbit of a planet where the planet is fat the rest from the sun
Perigee The point at which the moon closest to Earth.
Apogee The point where the moon is farthest from Earth.
Phases of the Moon The progression of changes in the moon's appearance during the month
Solar Eclipse An eclipse of the sun, a solar eclipse occurs when the moves in a line directly between Earth and the sun casting a shadow on Earth
Lunar Eclipse An eclipse of the moon, A lunar eclipse occurs when the moon passes through Earth's shadow.
Crater The depression at the summit of volcano or that which is produced by a meteorite impact
Ray Any of a system of bright elongated streaks sometimes associated with a crater on the moon,
Mare The latin name for the smooth areas of the moon formerly thought to be seas.
Rille Long channel associated with Lunar maria: A rille looks similar to a valley or a trench.
Lunar Regolith A thin, gray layer on the surface of the moon, consisting of loosely compacted fragment material believed to have been formed by repeated of meterites.
Created by: breannadriver888
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