Early sailors discovered a gradual change in position of the North Star. What did this discovery help to prove?
1 Answer
May 26, 2016
These observations gave the clue that the Earth's polar axis is having a precession-motion, along the surface of a double right circular cone , over a period of 258 centuries.
Explanation:
The observations were clues for the later finding that the Earth's polar axis is having a precession-motion, along the surface of a double right circular cone, over a Great Year period of 258 centuries.
The semi- vertical angle of this cone is
About 120 centuries ago, Vega was observed to be the North Star.
Now,it is Polaris.
The paths of the poles in precession are circles and the axis of the cone is normal to these circles.
