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solar rotation comparison table
Subject has base unit is a kind of has definition
differential rotation rotationAs an object rotates, different parts of it may move at different rates. The Galaxy rotates differentially.
solar motionlength per unit timepeculiar velocityThe velocity of the Sun through space, relative to the local standard of rest. The solar motion is U = -9 kilometers per second, V = +12 kilometers per second, and W = +7 kilometers per second.
solar rotationlength per unit timedifferential rotationDifferential rotation, the equatorial rotation taking less time than the polar by up to 9.4 Earth-days.

Next differential rotationgalactic rotation    Updifferential rotation, solar motion