Q. What is the "Sidereal Month" in Hours , Minutes and Seconds?
Answer: 27 days, 7 hours and 11.6 seconds
Notes: The sidereal month is the time needed for the Moon to return to the same place against the background of the stars. It is 27.321661 days (i.e., 27 days 7 hours 43 minutes 12 seconds), the difference between synodic and sidereal lengths is due to the orbital movement.

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