Dionysius then applied another astronomical timing mechanism based on precession of the equinoxes. Rotor tilt was controlled through gyroscopic precession. This phenomenon is called the precession of the equinoxes. Astrological ages are taken to be associated with the precession of the equinoxes. This approach is inconsistent with the precession of the equinoxes. This is called perihelion precession or apsidal precession. This led him to determine the first value of the precession of the equinoxes. Second, it has ignored outstanding problems such as the precession of equinoxes in astronomy. This three-dimensional movement is known as "precession of the ecliptic" or "planetary precession". The turn indicator is a gyroscopic instrument that works on the principle of precession. This provides an absolute reference for the determination of universal time, precession, and nutation. There is an easy way to understand why gyroscopic precession occurs without using any mathematics. The result is that the spin vector undergoes precession, just like a classical gyroscope. Newton derived an early theorem which attempted to explain apsidal precession. Lunisolar precession is about 500 times greater than planetary precession.