Final answer:
The phenomenon described is known as relative motion or apparent motion. It occurs when an observer's perspective or frame of reference affects their perception of motion.
Step-by-step explanation:
The phenomenon described, where movement is perceived but nothing is actually moving, is known as relative motion or apparent motion. It occurs when an observer's perspective or frame of reference affects their perception of motion. For example, if you were standing on a train platform and saw a train moving from left to right, it may appear as though a person on the train is also moving from left to right. However, from the person's frame of reference on the train, they are not actually moving. This is because our perception of motion is influenced by our position and perspective. Similarly, in the context of the heliocentric theory objection, the idea that we don't sense or feel the Earth's motion is due to our perspective and frame of reference on the Earth's surface.