Why can we see the zodiacal light phenomenon at some time around the vernal equinox and solar terms?

The vernal equinox is one of the 24 solar terms, and the vernal equinox is the midpoint of 90 days in spring, which is generally around 2 1 every year. The direct point of the sun is on the equator, and the world is divided equally day and night. In the time period, it refers to the position where the sun is located between 0 and 15, that is, from March 20th to April 5th. But in fact, it usually refers to the day when the sun is really at 0 degrees of the yellow meridian: March 20 or March 2 1. On the vernal equinox, the sunrise and sunset time is 6 o'clock all over the world.

Zodiacal light is formed by some dust particles that constantly surround the sun and reflect sunlight. Zodiacal light's silvery-white cone of light formed on the ecliptic plane due to the scattering of solar light by interplanetary dust is generally triangular, roughly symmetrical with the ecliptic plane and strengthened towards the sun. Generally speaking, zodiacal light is very weak. Under ideal observation conditions, it is not easy to see except after dusk in spring or before dawn in autumn. Zodiacal light is evidence of the existence of interplanetary matter.

Around the vernal equinox, zodiacal light can be seen in the western sky after sunset 1 to 2 hours, and it is better to observe it in low latitudes far away from urban light pollution. "zodiacal light is the reflection of the sun's light by some dust particles constantly surrounding the sun. Zodiacal light's silvery-white cone of light formed on the ecliptic plane due to the scattering of solar light by interplanetary dust is generally triangular, roughly symmetrical with the ecliptic plane and strengthened towards the sun. Zodiacal light is very weak and can only be seen after dusk in spring or before dawn in autumn under ideal observation conditions. "

The above is only a rough explanation, which can only be seen under good observation conditions. I hope it helps you.