Time cycles signify a 360-degree circular or elliptical rotation, orbit or journey in time typically of an object such as a planet or moon. In the case of the precession of the equinoxes, the cycle is determined by the 360 degree shifting of the equinoctal axis. Time cycles can also refer to larger rotations or orbits such as the time it takes for the Earth to make one complete revolution about the Galactic Center of the Milky Way.
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The Earth's day
The Earth's 360 degree rotation upon its axis in 24 hours is the measure of one day.
The Earth's year
The Earth's 360 degree rotation around the Sun in 365 days is the measure of one year.
The precession of the equinoxes
The 360 degree rotation of the equinoctal axis against the backdrop of the constellations and other stars in 25,920 years is the measure of the precession of the equinoxes.