Phases of the Moon

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Lecture 3 Phases of the Moon January 2c, 2014

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Earth's Moon

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Phases of the Moon

? The Moon orbits the Earth about once every month.

? The Moon appears to have different phases because we see more or less of the lighted side of the Moon depending on where it is with respect to the Sun.

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Waxing Gibbous

Full Moon

Waning Gibbous

First Quarter Last Quarter

Phases of the Moon

The green circle is the Earth, looking down on the north pole.

Waxing Crescent

New Moon

The Sun is MUCH further away than shown here. It is drawn here to indicate the direction from which the Moon and Earth are illuminated.

Waning Crescent

The Moon is depicted in its various positions during one month, with an adjacent image depicting how it appears from Earth.

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Animation 1

Animation 2

(try especially the "both top and Earth" view)

Phases - Photos

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