# SEA4Task3 - Earths Motion A 1 2 Looking down from space...

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Earth’s Motion A. 1. 2. Looking down from space upon the North Pole, the Earth spins counter-clockwise around its polar axis while it completes revolutions around the Sun. The polar axis is an imaginary line that travels through the earth from the northern pole to the southern pole. Right ascension (RA) is analogous to longitude. There are 24 equally spaced imaginary lines of RA that are on the Earth. There are only 24 lines because RA is traditionally measured in hours, minutes, and seconds, and it takes 24 hours to complete a full rotation of the Earth. B. 1. 2. The Moon completes one revolution around the Earth in a counter-clockwise direction every 27.3 days, called the sidereal month. This timeframe differs from the synodic month, which is 29.5 days. The difference in the two timeframes is accounted for by the fact that the Earth-Moon system is orbiting around the Sun as the Moon is orbiting the Earth, and a slightly longer period of time is required to accomplish a similar relative geometry.

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