We don't typically feel the Earth's rotation because our bodies are in a state of motion relative to the Earth's rotation. We are moving along with the Earth at the same rotational speed. This consistent motion gives us a sense of stability, and we don't perceive the rotation as a separate sensation.
Our bodies are adapted to the Earth's rotation since we have evolved on this planet. The inner ear, which plays a crucial role in our sense of balance and orientation, has adapted to the Earth's rotational movement. It contains fluid-filled canals and sensory receptors that detect changes in head position and motion. These structures are finely tuned to the Earth's rotation and allow us to maintain our equilibrium.
However, certain situations or conditions can make us more aware of the Earth's rotation. For example, when we are in a moving vehicle that accelerates or decelerates quickly or when we experience turbulence during a flight, we may feel a sense of disorientation or motion sickness. These situations disrupt the normal balance cues our body expects, leading to a perception of movement.
It's also worth noting that while we don't feel the Earth's rotation directly, we do experience the effects of rotation indirectly. The Earth's rotation causes phenomena like day and night, the apparent movement of the Sun across the sky, and the Coriolis effect (which influences weather patterns and ocean currents). These effects are observable and measurable, but we don't sense them as a direct physical sensation.