KnowraSidereal monthLinked fromLinked fromThe 8 pages that link to Sidereal month, each with the reason it gives.All 8Related 4Compared with 4Synodic monthCompared with: About 2.2 days shorter than the synodic month because the Sun's direction shifts during the orbit.Lunar monthCompared with: It is shorter because Earth’s motion around the Sun delays the return of the same phase.Tidal accelerationRelated: Lunar orbital expansion lengthens this period over time.LibrationRelated: Comparing orbital and rotational periods clarifies why synchronous rotation does not eliminate apparent motion.Hindu calendarRelated: It is one astronomical measure underlying lunar calendrical calculations.Draconic monthCompared with: Its longer duration shows the effect of moving nodes on the draconic month.Anomalistic monthCompared with: Roughly 0.23 days shorter: the perigee advances while the Moon orbits, so returning to perigee takes extra time.Orbit of the MoonRelated: It measures one revolution of the Moon around Earth against a nearly fixed sky.