Some Obscurish facts
#283
As the earth spins on it's axis it wobbles, so that a line drawn from the north pole into space traces a circle as the years go by. To be precise, the pole traces a circle at a rate of about one degree every 72 years - effecting which star we call the north star over long periods of time. This phenomenon is called the earths precession. A complete precession is called a Great Year, the time it takes for the north pole to point to the same north star again is 25,920 years, calculated by multiplying the 72 years it takes to move one degree by the 360 degrees in a circle
As the earth spins on it's axis it wobbles, so that a line drawn from the north pole into space traces a circle as the years go by. To be precise, the pole traces a circle at a rate of about one degree every 72 years - effecting which star we call the north star over long periods of time. This phenomenon is called the earths precession. A complete precession is called a Great Year, the time it takes for the north pole to point to the same north star again is 25,920 years, calculated by multiplying the 72 years it takes to move one degree by the 360 degrees in a circle