The Equator is the imaginary line that runs from pole to pole and divides the Earth into the Northern and Southern Hemispheres.

The Prime Meridian is the imaginary line that runs from east to west and passes through the center of the Earth.

Latitude is the measure of the angle between the Equator and a given point on the Earth's surface.

Longitude is the measure of the angle between the Prime Meridian and a given point on the Earth's surface.

The range of latitude values is -90° to 90°, with 0° representing the Equator, -90° representing the South Pole, and 90° representing the North Pole.

The range of longitude values is -180° to 180°, with 0° representing the Prime Meridian, -180° representing the 180th meridian, and 180° representing the 180th meridian.

Parallels are the lines of latitude that run parallel to the Equator.

Meridians are the lines of longitude that run parallel to the Prime Meridian.

The Tropic of Cancer is a tropic.

The Arctic Circle is a polar circle.

The latitude of the North Pole is 90°.

The longitude of the South Pole is 180°.

The latitude of the Equator is 0°.

The longitude of the Prime Meridian is 0°.

The difference in longitude between two points that are 15° apart is 15°.