# I Why are the planets revolving around their own axis?

1. Sep 12, 2017

### snorkack

Derivation of Earth angular momentum around Sun:
Mass of Earth - 6*1024 kg
Speed of Earth on orbit - 3*104 m/s
Lever arm of the speed - 1,5*1011 m
So angular momentum: 2,7*1040 J*s
Planck constant: 1,05*10-34 J*s
Thus the quantum number of Earth orbit - about 2,5*1074, as stated before.

2. Sep 12, 2017

### jbriggs444

This assumes that angular momentum is always quantized. If linear momentum and position are not quantized then there is no reason to expect that angular momentum is quantized. As @andrewkirk pointed out: