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Eclipses would happen twice a month if the moon's orbit were in the same plane as the Earth's orbit around the sun. The moon's orbit is slightly tilted, so eclipses are less frequent.

The plane of the moon´s orbit is inclined 5 degrees to the plane of the earth´s orbit around the sun. this being the case the moon´s orbit interesects the plane of the ecliptic at two different points (nodes). when one of these nodes is lined up with the sun and the moon passes through one of these nodes there is a solar eclipse. if the moon is at it´s apogee when this happens we have what´s called an annular eclipse because the moon´s disc does not completely block out the disc of the sun. when the moon is at there is a total eclipse.

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12y ago
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5mo ago

Eclipses do not happen twice a month because the Moon's orbit is tilted with respect to Earth's orbit around the Sun. This means that the Moon's shadow usually passes above or below Earth at the time of the new or full moon, resulting in fewer opportunities for eclipses. Eclipses typically occur a few times a year when the alignment of the Sun, Earth, and Moon is just right.

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Q: Why dont eclipses happen twice a month?
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