the study of stars and planets

an imaginary line about which a body rotates.

The spinning of Earth on its axis

The movement of an object around another object

The path an object follows as it moves around another object

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

Caused by the tilt of Earth on its axis as it revolves around the Sun

Distance north or south of the equator

Distance east or west of the prime meridian

Time when the Sun is farthest from the equator.

Each of the two times of the year when days and nights are of equal length

the day of the year that marks the beginning of spring in the northern hemisphere

The day of the year that marks the beginning of fall in the Northern hemisphere

A force that pulls objects toward each other

a period of twenty-four hours as a unit of time, reckoned from one midnight to the next, corresponding to a rotation of the earth on its axis.

the only planet in the solar system on which life is known to exist

A typical star that is the source of light and heat for the planets in the solar system.

The partial or total blocking of one object in space by another

Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth

Earth blocks sunlight from reaching the moon

The darkest part of a shadow

The part of a shadow surrounding the darkest part

The rise and fall of ocean water that occurs every 12.5 hours or so

The highest level of water along a shore

When the tidal range is greatest. (full moon and new moon)

A tide with the least difference between high and low