What are the four extra minutes in the solar day are due to our?

The four extra minutes in a solar day are due to the Earth's elliptical orbit around the Sun and its axial tilt. As the Earth orbits, it moves not only in a circular path but also rotates on its axis, causing the solar day to differ slightly from the standard 24-hour day. This variation results in the solar day averaging about 24 hours and 4 minutes. Consequently, the solar time we observe is slightly longer than the uniform time measured by atomic clocks.