What is the solar term and date of the vernal equinox in the northern hemisphere?

June 2 1 day is the vernal equinox in the northern hemisphere and the autumn equinox in the southern hemisphere.

Because on March 2 1 day, the sun just points to the equator, the vernal equinox in the northern hemisphere and the autumnal equinox in the southern hemisphere.

September 23rd is the vernal equinox in the southern hemisphere and the autumn equinox in the northern hemisphere. On this day, the sun also points directly at the equator.

The direct position of the sun moves back and forth between the tropic of cancer.

When crossing the equator from south to north (around March 2 1), spring came in the northern hemisphere and autumn came in the southern hemisphere. This day is the vernal equinox in the northern hemisphere.