My question is without a fixed point of reference, wouldn't it all be conjecture? How do we know we are moving at 70,000 KPH? In relation to what? If we are moving away from a celestrial object at say 70,ooo K/PH, how do we know we are not moving at 45,000 k/ph, and the object in question isn't moving at 25,000 k/ph in the opposite direction. This is an over simplification, but you catch my solar drift.

It reminds me of the algebraic problem when you have 6 coins of two types equaling $0.90. We have enough data to solve the equation, but what are the constant terms in the 70,000 k/ph? No doubt for me, we are in motion, but can we even determine a direction and are we assuming a constant velocity? We know our Milky Way spins, so the further out we travel, we are neither traveling in a strait line, nor a constant velocity. Correct? Or have I left our planet mentally.