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Sidereal Period versus Synodic Period. 1  Measuring the motion of the Moon around the Earth relative to the distant stars leads us to what is called the sidereal period. 2  Measuring the motion of the Moon around the Earth relative to the Sun leads us to what is called the synodic (pronounced si-nod-ik) period.
Answers. Best Answer: The sidereal (sr) rotation period is 16 hours, 6 minutes and 36 seconds. That's how long it takes to rotate relative to the stars. Since the Neptune year is 60,190 earth days, you need to figure out how many Neptune sidereal days that is. (Answer: 89,669 Nep. sr days). Then figure out what time period is 1/ 89,669 of a Nepture sr day. (Answer: 0.65 seconds).