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Solar System
A set of objects orbiting around a star. The objects are kept in their orbits because of gravity.

Rotation
A planet or moon spinning

Axis of Rotation
An imaginary center line a planet or moon spins on
Revolution/Orbit
A planet or moon following a circular path around another object (a planet or star)

Earth Day
One complete rotation of Earth (24 hours)
Earth Year
One complete revolution (orbit) of Earth around the Sun (365 days)
Longitude
The angular distance of a place east or west from the meridian (the line through Greenwich, England)

Latitude
The angular distance of a place north or south from the Earth's equator

Northern Hemisphere
The half of Earth north of the Equator

Southern Hemisphere
The half of Earth south of the Equator

Equator
An imaginary circle around the middle of Earth, halfway between the North Pole and the South Pole

North Pole
The northernmost point of Earth's axis
South Pole
The southernmost point of Earth's axis
Horizon
The imaginary line where the sky meets the ground or the ocean

Point of View
The position from which an observation is made. Examples: View From Earth, View From Space, View From Above, Side View