The Kryptonite Physics

Relative motion and inertial reference frames do not work for any point on a rotation that is moving.
An observers position can not change what is happening overall to what is observed, it only changes what they see.

The Kryptonite Physics.
To appreciate this information it is important you understand the physics talked about see 3 and 4 below.

3. Rigid body rotation with translation.
https://youtu.be/i8BIzW5MKPA

4. Relative motion and inertial reference frames.
https://youtu.be/iWScYEYgPc8

The points raised in this simplest way possible, fundamentally change physics.

Relative motion and inertial reference frames.
Do not apply to anything on a rotation moving, unless its at the very center.
We are told we live on a rotation, that is on a rotation and another surrounded by rotations.

Print the last 2 screens on A4, then go and ask questions.

Vector addition tool.
https://ophysics.com/k2.html