It all depends on your point of view (literally, frame of reference). The Earth can be considered: - stationery (geocentric observer) - orbiting the Sun (hel

It all depends on your point of view (literally, frame of reference). The Earth can be considered: - stationery (geocentric observer) - orbiting the Sun (heliocentric observer) - spiraling about the Sun (galaxy-centric observer) All of these are simultaneously correct and bonkers in conjunction. Hence, you need a frame of reference if you're specifying movement.