English Language & Usage Asked by Libavius on October 3, 2021
Two objects are termed "counter-rotating", if they rotate in opposite direction, i.e. one rotates clockwise while the other rotates counter-clockwise. (see: counter-rotating propellers)
Is there also a word for objects rotating in the same direction? I though of "corotating", which however seems to have different meanings.
Your dictionary search should have revealed corotate and corotational
corotate, intransitive verb: to rotate in conjunction with or at the same rate as another rotating body
Also see
Corotational: That rotates in conjunction with another body
Oxford Reference gives the example of two bodies spinning about their common centre of mass, and therefore necessarily in the same clockwise or anti-clockwise way.
Where one body orbits another, the circumstance in which one or both bodies have an axial rotation period the same as the orbiting body's revolution period. The co-rotating body therefore keeps one face permanently turned towards the other, as in the case of the Moon facing the Earth. In the case of Pluto and its satellite Charon, both bodies are in co-rotation and so each keeps the same face turned to the other. See also spin–orbit coupling; synchronous rotation.
Answered by Anton on October 3, 2021
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