a person or thing that retracts. Anatomy. a muscle that retracts an organ or protruded part. Surgery. an instrument or appliance for drawing back an impeding part, as the edge of an incision. a mechanism, device, or the like that regulates retraction: to adjust the retractor on a seat belt.
The Moon orbits Earth in the prograde direction and completes one revolution relative to the stars in approximately 27.323 days (a sidereal month). Earth and the Moon orbit about their barycentre (common center of mass), which lies about 4,600 km (2,900 mi) from Earth's center (about 34 of the radius of Earth).
It takes the moon 29.5 days to go through all phases, from full moon, back to full moon for example. Relative to the background stars and ignoring the earth position relative â¦ to our sun, the moon takes 27 days 7 hours and 43 minutes to orbit the earth-the sidereal orbit.ow long does it take the moon to go from full-moon phase to new-moon phase? The full lunar cycle is roughly 4 weeks, and from full-moon to new-moon is half the cycle, so it would take (roughly) 2 weeks to go from full to new moon.