Synchronous rotation

Synchronous rotation
Due to synchronous rotation of their moon, the inhabitants of the central body will never be able to see its side marked with green.

In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting. Another way of describing it is that from the surface of the satellite, the main planet appears to be locked in place in the sky as it slowly rotates.

The Moon is in synchronous rotation about the Earth.


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  • synchronous rotation — Astron. rotation of a satellite in which the period of rotation is equal to the period of orbit around its primary, leaving the same face always pointing toward the primary: The moon is in synchronous rotation about the earth. [1970 75] * * * …   Universalium

  • synchronous rotation — Astron. rotation of a satellite in which the period of rotation is equal to the period of orbit around its primary, leaving the same face always pointing toward the primary: The moon is in synchronous rotation about the earth. [1970 75] …   Useful english dictionary

  • Synchronous orbit — A synchronous orbit is an orbit in which an orbiting body (usually a satellite) has a period equal to the average rotational period of the body being orbited (usually a planet), and in the same direction of rotation as that body.PropertiesA… …   Wikipedia

  • synchronous satellite — synchronous satellite, an artificial satellite whose orbit is synchronous with the rotation of the earth on its axis. It orbits the earth once every 24 hours at a fixed altitude above the equator, and thus appears to be stationary; geostationary… …   Useful english dictionary

  • synchronous orbit — noun (Military) A satellite orbit where the orbital period is equal to, or multiples of, the Earth’s rotational period; i.e. making one, two, three, etc., orbits in a 24 hour period. ::Examples include geosynchronous (period equals Earth’s… …   Wiktionary

  • synchronous motor — noun electric motor in which the speed of rotation is proportional to the frequency of the A.C. power (Freq. 1) • Hypernyms: ↑electric motor …   Useful english dictionary

  • Sun-synchronous orbit — Diagram showing the orientation of a Sun synchronous orbit (green) in four points of the year. A non sun synchronous orbit (magenta) is also shown for reference A Sun synchronous orbit (sometimes called a heliosynchronous orbit) is a geocentric… …   Wikipedia

  • Shaded-pole synchronous motor — Shaded pole synchronous motors are a class of AC motor.Like a shaded pole induction motor, they use field coils with additional copper shading coils (see the illustration) to produce a weakly rotating magnetic field. But unlike a shaded pole… …   Wikipedia

  • Binary Synchronous Communications — Binary Synchronous Communication (BSC or Bisync) is an IBM link protocol, announced in 1967 after the introduction of System/360. It replaced the synchronous transmit receive (STR) protocol used with second generation computers. The intent was… …   Wikipedia

  • orbit, synchronous satellite —    The path followed by a communications satellite that is at such a distance above the earth (about 35,880 km) that the satellite keeps pace with the earth s rotation and thus hovers above a particular point on the earth …   IT glossary of terms, acronyms and abbreviations

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