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First / Third quarter moon

Mouse over the preview image and click the play icon to see a flash version of the animations.  Download high-resolution animations using links below.

First Quarter Moon – This animation fixes the moon in its orbit at the first quarter phase. This occurs when the Moon is 90° past the new phase, in the counter-clockwise direction. From our perspective on Earth we see only half of the face lit by the sun (or a quarter of the moon).

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Quicktime Movie
MPEG 4 Movie
AVI Movie

Third Quarter Moon – This animation fixes the moon in its orbit at the third quarter phase. This occurs when the Moon is 270° past the new phase, in the counter-clockwise direction. From our perspective on Earth we see only half of the face lit by the sun (or a quarter of the moon).

Download Options

Quicktime Movie
MPEG 4 Movie
AVI Movie

Animations produced by PSI scientist Steve Kortenkamp.

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