Learned: Inertial Frame of Reference

The laws of physics work perfectly within any inrtial frame of reference. This is how the earth can rocket and spin through space and yet I can appear to be standing still in space. From my point of view, I am standing still compared to other "stationary" things on earth.

Goodness, I don't know exactly how to explain it; it just clicked as I was reading Bloomfield's How Everything Works.