Is the revolution of the earth moving at a constant speed or at a variable speed? If it is variable-speed exercise, is it regular? What is its revolution law (movement speed during the four solar term

Is the revolution of the earth moving at a constant speed or at a variable speed? If it is variable-speed exercise, is it regular? What is its revolution law (movement speed during the four solar terms) Hello!

It must be a variable-speed movement, because it has a centripetal acceleration and its orbit is elliptical. The earth is closest to the sun on the solstice in winter and farthest from the sun on the solstice in summer. That is, the earth is at perihelion in winter solstice and apohelion in summer solstice, so from winter to spring and then to summer, the earth is farther and farther away from the sun, and its potential energy increases and its kinetic energy decreases, that is, its speed decreases. From summer to autumn until winter, the earth is getting closer and closer to the sun, the potential energy decreases and the kinetic energy increases, that is, the speed is getting bigger and bigger. The direction of speed is always changing.

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