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Additional Slide [not shown in class]<br />
… “Months” based on the Moon’s orbit around the Earth<br />
But just as for Earth- Sun system …<br />
… have to distinguish<br />
Synodic Month (from new moon to next new moon)<br />
29.53059 d<br />
from<br />
Sidereal Month (from fixed location on sky, back to same location)<br />
27.32158 d<br />
Earth’s rotation, orbit & Moon’s orbit<br />
also why high tides are 24hr 50min apart<br />
(not 24hrs exactly)<br />
Ian M. George PHYS 304 (2011 Fall) Meeting 04
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