Page 188 - Science Course 3 (Book 2)

Mo12-L4b: What is a Lunar Eclipse?

LUNAR ECLIPSE

When the entire Moon moves through Earth’s umbra,
a total lunar eclipse occurs. Key Concept
What is a Lunar Eclipse?

When can a lunar eclipse occur?

When only part of the Moon passes through Earth’s
umbra, a partial lunar eclipse occurs.

Lunar eclipses can only occur during a full moon
phase, when the Moon and the Sun are on opposite
sides of Earth.

Tides

A tide is the daily rise and
fall of sea level.

It is primarily the Moon’s
gravity that causes Earth’s
oceans to rise and fall twice
each day.

The Moon’s gravity is
slightly stronger on the side
of Earth closer to the Moon
and slightly weaker on the
side of Earth opposite the
Moon.
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