Those two solar terms are the same day and night.

These two solar terms are the same day and night:

The correct answer should be the vernal equinox and autumnal equinox every year. The vernal equinox on March 2 1 every year is divided equally between day and night, and the direct point of the sun is the equator. The autumnal equinox around September 23 every year is divided equally between day and night, and the direct point of the sun is the equator.