Saturday, September 22, 2007

Blog Contest #4

Update: Typo corrected (south vs north) Thanks to Dave Renneke for pointing it out.

Today is the autumnal equinox, when the sun crosses the celestial equator. At this time of year the sun rises almost exactly east and sets almost exactly west. You may have noticed this while driving down east-west roads: the sun is directly in front of you (in your eyes) when going east in the morning or west in the evening. After the autumnal equinox, the sun will begin to rise (and set) further and further south of east (west), making this less of a problem.

Near the autumnal equinox, the full moon also rises almost directly east and sets almost directly west. You can observe this on Wednesday, the next full moon.

The contest question is this:
After the autumnal equinox, the sun will begin to rise further and further south of east, but what will the full moons do? Will the full moons in October and November rise north of east? south of east? or almost directly east, like the one this month?

Explain your answer. Why does the moon (not) do the same thing the sun does?

Deadline: the next new moon.

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