Earth, Sun, Moon System

Front

What is a total solar eclipse?

Back

A total solar eclipse occurs when the Moon completely covers the Sun, as viewed from Earth.

Front

Why are total solar eclipses more difficult to witness?

Back

Because the umbra covers a small area on Earth.

Front

How long does it take for the Earth to rotate once?

Back

24 hours.

Front

What is an equinox?

Back

An equinox is a point in time when day and night are approximately equal in length, occurring twice a year.

Front

Which two positions represent an equinox?

Back

Positions A and C.

Front

How long does it take to complete one lunar cycle from New Moon to New Moon?

Back

29.5 days.

Front

How long does it take for the Moon to complete one rotation?

Back

27.3 days.

Front

What is the difference between a solar eclipse and a lunar eclipse?

Back

A solar eclipse occurs when the Moon passes between the Earth and the Sun, while a lunar eclipse occurs when the Earth passes between the Sun and the Moon.

Front

What is the penumbra in an eclipse?

Back

The penumbra is the outer part of a shadow where the light is partially blocked.

Front

What is the umbra in an eclipse?

Back

The umbra is the central part of a shadow where the light is completely blocked.