Astronomy and Time Concepts

Front

Axis

Back

An imaginary line that passes through a planet’s center and its north and south poles, about which the planet rotates.

Front

Rotation

Back

The spinning motion of a planet on its axis.

Front

Revolution

Back

The movement of an object around another object.

Front

Orbit

Back

The path of an object as it revolves around another object in space.

Front

Calendar

Back

A system of organizing time that defines the beginning, length, and divisions of a year.

Front

Solstice

Back

Either of the two days of the year on which the sun reaches its greatest distance north or south of the equator.

Front

Equinox

Back

Either of the two days of the year on which neither hemisphere is tilted towards or away from the sun.