Front

Astronomy

Back

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

Front

International Date Line

Back

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

Front

Axis

Back

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

Front

Revolution

Back

Earth's one complete trip around the sun.

Front

Rotation

Back

Earth spinning on its axis. Takes 24 hours.

Front

Reflecting Telescope

Back

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

Front

Refracting Telescope

Back

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

Front

Standard Time Zone

Back

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

Front

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.