Trading period

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The rotation period (rotation period) - the time that passes between two consecutive moments in which the body rotates in uniform rotation, takes the same orientation in space. The rotation period T of the rotating body at angular velocity ω is given by: T = 2 π ω {\displaystyle T={\frac {2\pi }{\omega }}} ,

Its unit in SI is second.

The rotation period can be a well defined only for rigid bodies, for example for the Earth is about 23 h 56 min. The period of rotation of the Sun depends on the heliographic distance and changes from about 25 days on the solar equator to more than 31 days on the poles, also changes with the distance from the center of the Sun, which can be studied by the methods of heliosejsmology. This phenomenon is caused by the fluidity of the substance that creates the Sun.

For a material point that rotates about an axis not passing through that point, the rotation period is the full rotation angle of this point.

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