However, the rotation speed of the earth remains unchanged. Assuming that the long path taken during a certain period of time at perihelion is just enough to transfer the sun to transit twice, the short path taken at apohelion is not enough for the sun to transit twice, so we need to walk for a while.
It changes gradually between perihelion and perihelion
I remember that sidereal day is unchanged. I just checked Wikipedia and said that the nutation of the earth will cause inequality in sidereal day, but it is estimated that the impact will not be particularly significant and will not change like the solar day.