# SOLAR SYSTEM

## UNIVERSE

### SATELLITESICY BODIES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The moon revolves round the earth and also rotates on its axis in ____ days each.
 A 27.3 B 37.2 C 26.3 D 24.3
Explanation:

Detailed explanation-1: -The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis . As a result, the moon does not seem to be spinning but appears to observers from Earth to be keeping almost perfectly still. Scientists call this synchronous rotation.

Detailed explanation-2: -The Moon displays these eight phases one after the other as it moves through its cycle each month. It takes about 27.3 days for the Moon to orbit Earth. However, because of how sunlight hits the Moon, it takes about 29.5 days to go from one new moon to the next new moon.

Detailed explanation-3: -(b) The angular speed of the moon in its orbit about the earth is = 2/(27.3 days) = 2/(27.3*24*60*60 s) = 2.7*10-6/s.

Detailed explanation-4: -This movement is from the Moon’s orbit, which takes 27 days, 7 hours and 43 minutes to go full circle. It causes the Moon to move 12–13 degrees east every day. This shift means Earth has to rotate a little longer to bring the Moon into view, which is why moonrise is about 50 minutes later each day.

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