The Natural Navigator by Tristan Gooley

Author:Tristan Gooley
Language: eng
Format: epub
Publisher: The Experiment
Published: 2011-06-15T16:00:00+00:00

What We See

The sun and moon appear to move in a similar plane from east to west, but because the moon’s orbit makes it move slowly east in the sky, the sun appears to move marginally faster than the moon. If they are in the same place in the sky one day, then the following day the moon will have “slipped back” by 1/29.5th of the way, or approximately 12.2 degrees (one extended fist-width plus an extra knuckle). The following day it will have slipped another 12.2 degrees. After fifteen days the moon will be lagging the sun by 15 × 12.2 degrees, which is very nearly 180 degrees. Two weeks after that the moon will have slipped so far back that the sun will have caught up with it and the cycle begins again.

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