When were the constellations divided?

The constellation originated from the primitive Babylonians on the Mesopotamian plain. They divide the ecliptic plane into 12 regions, which are called "zodiac signs", and the zodiac signs correspond to twelve constellations respectively. Generally speaking, the date of birth in the west is based on the Gregorian calendar, so most people think that constellations are calculated according to the Gregorian calendar.

For us in China, there are still two calendars in use, one is the international solar calendar, and the other is the lunar calendar handed down by our ancestors. There are some differences in time between the two calendars. In fact, these two calendars are essentially interlinked and can be converted to each other. Therefore, whether you know the solar calendar or the lunar calendar, as long as the date and time are accurate, you can calculate it correctly.

According to the time points of qi in 12 of the twenty-four solar terms of the lunar calendar, that is, vernal equinox, Grain Rain, Xiaoman, summer solstice, summer heat, autumnal equinox, first frost, light snow, winter solstice, severe cold and rain, the boundaries of the twelve constellations are divided, and the twelve constellations are arranged in turn with the vernal equinox (the moment when the sun directly hits the equator of the earth, that is, the moment when the sun reaches 0 degrees of the yellow meridian) as the starting point.

The solar calendar date and solar terms division query table of the Sun Constellation is as follows:

Gregorian calendar date (rough) solar terms (accurate)

Aries: March 21~ April 19 (vernal equinox-Grain Rain)

Taurus: April 20th to May 20th (Grain Rain-Xiaoman).

Gemini: may 21~ June 20 (xiaoman-summer solstice)

Cancer: June 21~ July 22 (summer solstice-hot summer)

Leo: July 23rd to August 22nd (summer-summer).

Virgo: August 23rd to September 22nd (summer solstice and autumn equinox).

Libra: September 23rd ~ 65438+1October 22nd (autumnal equinox-first frost).

Scorpio: 65438+1October 23rd ~165438+1October 22nd (first frost-light snow).

Sagittarius:165438+1October 23rd to 65438+February 2nd1(light snow-winter solstice)

Capricorn: 65438+February 22nd ~ 065438+1October 19 (winter solstice-severe cold)

Aquarius: 065438+1October 20th to February 18 (cold-rain)

Pisces: February19 ~ March 20 (rain-vernal equinox)