What happens every 28 days with the moon?

Answer 1

What's a lunar cycle ?

-- If you use a star in the sky as a marker, the moon passes it every 27.32 days.

-- If you go by the phases of the moon, the time between two occurrences of

the same exact phase is 29.53 days.

Answer 2

Yes actually.

The time between two full moons (and between successive occurrences of the same phase) is about 29.53 days (29 days, 12 hours, 44 minutes) on average (hence, the concept of a timeframe of a period of time of an approximated month was derived). This synodic month is longer than the time it takes the Moon to make one orbit about the Earth with respect to the fixed stars (the sidereal month), which is about 27.32 days. This difference is caused by the fact that the Earth-Moon system is orbiting about the Sun at the same time the Moon is orbiting about the Earth.

The second full moon of the month is called a blue moon.

Answer 3

A complete cycle of phases for the Earth, if you're on a part of the Moon where you can see it (for someone on the Moon, the Earth doesn't appear to rise or set, it just sort of wiggles in place unless it's right on the horizon, in which case the wiggle might make more or less of it visible).

Answer 4

It is false, unless you consider 28 to be close enough to 27.32, the true orbital period of the moon. The synodic period (the period which is in synch with the observed moon phases) of the moon is 29.53 days. The large difference between these two periods is counter-intuitive and not easily understood, but it is real. The sidereal orbit of the moon around the earth, the orbit as it would be observed from far to the north of the solar system, and the orbit as it would be defined relative to the distant stars, is the orbit of 27.32 days. But remember that as the moon orbits the earth, the earth is also in the process of orbiting the sun. So the moon has to move around the earth a little longer than 27.32 days in order to 'catch up' with where it was relative to the earth and the sun. That is why the cycle of moon phases, the synodic orbit, is 29.53 days even though a true sidereal orbit happens every 27.32 days.

Answer 5

it rotates,but we only see portion of the rotation

Answer 6

The Moon takes 29 days 12 hours and 44 minutes (29.53 days) to display

the full range of all possible appearances, or "phases".

Answer 7

The moon orbits the earth once each 27.32 days.

The complete cycle of phases is seen from earth once every 29.53 days.

Which of those cyclic phenomena is puzzling you ?

Answer 8

it's because it takes 28 days for the earth's moon to orbit the sun.

Answer 9

A full cycle (for example, from full moon to full moon) is about 29 1/2 days, on average.

Answer 10

About once. The Moon rotates once in 27.3 days.