The spinning of Earth on its axis.

The path Earth follows as it revolves around the sun.

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

The days when the sun is farthest north and south of the equator.

The study of the moon, stars and other objects in space.

The movement of one object around another.

The days when day and night everywhere on Earth is about 12 hours.

The imaginary line that passes through Earth's center and the North and South poles.

_____ is/are caused by the moon's gravitational pull on different parts of the Earth.

When the moon passes directly between the Earth and sun.

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