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It takes roughly one month for the moon to orbit (loosely, to revolve around) the earth - the moon's angle to the sun causing the moon's apparent phases as it does so.

Examined in greater detail, here are various distinctions in exactly how the orbit can be interpreted:

1) The sidereal month - the time it takes to orbit the earth with respect to fixed distant stars = about 27.3 days

2) The synodic month - with respect to the sun, when it reaches the same apparent phase = about 29.5 days. (Longer than the sidereal month because the earth has advanced in its orbit around the sun during the month)

3) tropical month - with respect to where the sun is at the vernal equinox = about 27.3 days (barely less than sidereal month)

4) anomalistic month, the interval between perigees or closest point of approach to the earth = about 27.55 days. Note that the same side of the moon faces the earth because its rotational period (spin on its axis) is equal to its orbital period, i.e., tidally locked; but because it is sometimes closer and sometimes further from the earth where the spin and orbit don't "match" there appears to be a slight apparent wobble or libration which allows us to see slightly around the moon's edges.

5) draconic or nodical month - with respect to the ascending node (crossing the orbital plane) = about 27.21 days.

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