Although you are not moving with respect to the chair, you are moving with the Sun at a speed of more than 100,000 km/h.
The half facing the sun is light (day) while the half facing away from the sun is dark (night). We can't feel Earth turning since we're all moving with it, at the same constant speed. Each 24-hour day, the Earth rotates once around its axis.
How quick are we compared to the speed of light?
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