Full Moons

Is the interval of time between one full Moon and the next equal to 28 days?

Answers

No, the orbital period of the Moon is 27.554 sidereal days, and the average interval between full moons was 29.535 days for the twentieth century. The difference between these two time periods occurs because Earth is moving with respect to the stars, so the Moon must travel slightly farther around its Earth orbit to reach its full Moon position along the Sun-to-Earth radial line.

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