Astronomy Terms

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Astronomy

Back

The scientific study of space, and the universe as a whole.

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International Date Line

Back

An imaginary line on the Earth's surface defining the boundary between one day and the next.

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Axis

Back

An imaginary line which Earth rotates on (23.5 Degrees).

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Revolution

Back

Earth's one complete trip around the sun.

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Rotation

Back

Earth spinning on its axis. Takes 24 hours.

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Reflecting Telescope

Back

A telescope that uses curved mirrors to reflect light and form an image.

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Refracting Telescope

Back

A type of telescope that uses a lenses to form an image.

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Standard Time Zone

Back

A vertical belt, about 15 degrees wide in longitude, in which all locations have the same time.

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Universe

Back

All existing matter and space considered as a whole; the cosmos.

Front

Foucault Pendulum

Back

A device used as an experiment to demonstrate the Earth's rotation.