How to treat the revolution speed of the earth from vernal equinox to the sun?

You can't judge by two minutes in a day. It is necessary to combine the relationship between the perihelion and apohelion of the earth in each solar term when the earth revolves.

The earth passes through perihelion near the winter solstice solar terms and apohelion near the summer solstice solar terms. According to the law of planetary motion, at perihelion, the linear velocity of planetary revolution is the fastest; At apohelion, the linear speed of revolution is the slowest.

Therefore, when the earth is close to the solar term of the winter solstice, the revolution speed is the fastest. When it is close to the summer solstice solar term, the linear speed of revolution is the slowest. Near vernal equinox, the earth is not far from the sun, on the average distance, so the linear speed of revolution is basically the average speed of revolution.