The time it takes one object to complete one orbit around another.

The time required for an object to move once around the sky, relative to the stars.

one complete revolution of a celestial body with respect to a fixed point in the heavens, such as a star.

the period of revolution of one object around another measured with respect to the stars (e.g., for the Moon, it is 27.3 days).

A period determined by or from the stars. [ 39

The period of revolution of one body about another measured with respect to the stars.

A rotational or orbital period of time with a fixed stellar Point taken as reference.

The orbital period relative to the stars.

The period of revolution of a planet around the Sun or a satellite around its primary.

The sidereal period is the time it takes a planet (or other body) to complete one orbit around the sun (with reference to the stars). It is usually expressed in Earth years.