What are vernal equinox and autumnal equinox?

Every year around September 23rd, when the sun reaches longitude 180 degrees, it enters the "autumnal equinox" solar term. Generally speaking, most people who are snakes have a sense of humor, but there are exceptions. Some people are indifferent, while others often laugh at and ridicule others. Some people are amiable, while others are cruel. The best time to observe all this is when the snake man is forced. In times of crisis, people who belong to snakes can always make jokes to enliven the atmosphere, and even under great pressure, they can look fearless.