What do the two solar terms mean about the symmetry of the sun?

Two solar terms with opposite lengths of day and night.

Summer solstice and winter solstice, as well as heavy snow. The hemispheres of the sun's direct points are different, but the latitudes are the same, so the lengths of two days and nights are opposite, and the vernal equinox and autumnal equinox are also two solar terms symmetrical about the sun.

The sun, the central celestial body in the solar system, is a star located in the center of the solar system, with a diameter of about 1392000 km and a mass of about 2× 103? Kilogram. The sun accounts for 99.86% of the total mass of the solar system, and about three quarters of the mass is hydrogen. It releases light and heat into space through nuclear fusion and rotates around the center of the Milky Way.