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If the axis of the rotation lies external of the body in question then the body is said to orbit.

There is no fundamental difference between a “rotation” and an “orbit” and or "spin".

In astronomy, rotation is a commonly observed phenomenon.

Stars, planets and similar bodies all spin around on their axes.

The key distinction is simply where the axis of the rotation lies, either within or outside of a body in question.

This distinction can be demonstrated for both “rigid” and “non rigid” bodies.

The time-rate of change of angular frequency is angular acceleration (rad/s²), This change is caused by torque.

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The axis is 90 degrees perpendicular to the plane of the motion.(See also Precession of the equinoxes and Pole star.) While revolution is often used as a synonym for rotation, in many fields, particularly astronomy and related fields, revolution, often referred to as orbital revolution for clarity, is used when one body moves around another while rotation is used to mean the movement around an axis.Moons revolve around their planet, planets revolve about their star (such as the Earth around the Sun); and stars slowly revolve about their galaxial center.Thus, the rotations around a point/axis form a group.However, a rotation around a point or axis and a rotation around a different point/axis may result in something other than a rotation, e.g. Rotations around the x, y and z axes are called principal rotations.The rotation rate of planets in the solar system was first measured by tracking visual features.

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