Translation of "siderische Periode" into English

time taken for a given object to make one complete orbit around another object, and applies in astronomy to mostly either planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars

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.