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There are two circumstances:

If the Moon circled the Earth in the same direction (east to west), there would be overall directional changes:

-- The sun, moon, and stars would all appear to rise in the west and set in the east.

-- The sequence of the constellations of the Zodiac would be reversed.

-- There would be substantial changes in the world's climate zones.

a) In the northern hemisphere, low-pressure systems would rotate to the right, and high-pressure systems would rotate to the left.

b) In the northern hemisphere, the jet stream would blow from east to west, weather systems would move across the US from the east coast toward the west coast, an eastbound commercial flight would take longer than the return flight, the east face of the Rockies would be the wet, fertile side, the winds in the tropics would prevail from the east, and all the Divi Divi trees on Aruba would lean the other way.

If the Moon circled the Earth in the direction it does now, becoming the opposite of the rotation of the Earth.

-- In the short term, the Moon would cross the sky in less time than the Sun, instead of taking slightly longer. The tides would be greatly altered, not only because of the change in how they were affected by topography.

-- In the long term, it would probably result in either a collision with the Earth or a near miss that would eject the Moon from Earth orbit. The drag of tidal forces from Earth's gravity would be much greater than it currently is, slowing the Moon in its orbit. Instead of inexorably moving away from Earth as it does now, it would move steadily closer.

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12y ago

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