Vocabulary Definitions ESS1-1

Front

Aphelion

Back

The point in Earth's orbit where it is farthest from the Sun.

Front

Apogee

Back

The point in the Moon's orbit where it is farthest from Earth.

Front

Axis

Back

An imaginary line that Earth spins around; it goes from the North Pole to the South Pole.

Front

Crescent

Back

The shape of the Moon when it looks like a sliver or thin curve.

Front

Cyclic

Back

Something that happens in a repeated cycle, like the phases of the Moon.

Front

Direct

Back

Sunlight or energy that comes in a straight line and hits Earth more strongly.

Front

Earth

Back

The third planet from the Sun, where we live.

Front

Eclipse

Back

An event where one object, like the Moon or Sun, is blocked by another object in space.

Front

Ecliptic

Back

The path that the Sun appears to take through the sky over the course of a year.

Front

Ellipse

Back

A stretched-out circle; the shape of Earth's orbit around the Sun.