Differential rotation is seen when different parts of a rotating object move with different angular velocities (rates of rotation) at different latitudes and/or depths of the body and/or in time. This indicates that the object is not solid. In fluid objects, such as accretion disks, this leads to shearing. Galaxies and protostars usually show differential rotation; and examples in the Solar System include the Sun, Jupiter and Saturn.
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Some articles on differential rotation:
... See also Solar rotation On the Sun, the study of oscillations revealed that rotation is roughly constant within the whole radiative interior and variable with radius and latitude ... The Sun has an equatorial rotation speed of ~2 km/s its differential rotation implies that the angular velocity decreases with increased latitude ... The poles make one rotation every 34.3 days and the equator every 25.05 days, as measured relative to distant stars (sidereal rotation) ...
... Surface differential rotation is observed on stars such as the Sun when the angular velocity varies with latitude. 31993.) The first such star, other than the Sun, to have its differential rotation mapped in detail is AB Doradus ... The underlying mechanism that causes differential rotation is turbulent convection inside a star ...
Famous quotes containing the words rotation and/or differential:
“The lazy manage to keep up with the earths rotation just as well as the industrious.”
—Mason Cooley (b. 1927)
“But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.”
—Antonin Artaud (18961948)