sidereal period
period is the time required for a celestial body within our solar system to complete one revolution with respect to the fixed stars i.e., as observed from some fixed point outside the system.
en-US/saɪˈdiɹiəl ˈpiɹiəd/
period is the time required for a celestial body within our solar system to complete one revolution with respect to the fixed stars i.e., as observed from some fixed point outside the system.