The angular velocity of the earth's surface is the same at any place except the north and south poles. But why is the perihelion and the aphelion?

The angular velocity of the earth's surface is the same at any place except the north and south poles. But why is the perihelion and the aphelion?

"The rotation speed of the earth's surface is equal at any place except the north and south polar points." this sentence refers to the study of the earth's rotation with the earth's axis as the rotation axis. The research objects are the particles on the earth's surface
The phrase "perihelion and aphelion" refers to the study of the earth's revolution around the sun