Why is there a 12 constellation?

Constellation originated in Babylon, one of the four ancient civilizations. The Babylonians divided the sky into many regions and called them "constellations", but at that time constellations were of little use and were rarely found and named. The constellation 12 on the ecliptic was originally used to measure time, not to express people's character as it is now.

1922, the General Assembly of the International Astronomical Union decided to divide the sky into 88 constellations, and their names basically followed the historical names. 1928, the international astronomical union officially announced the names of 88 constellations. These 88 constellations are divided into three celestial regions, 29 in the northern hemisphere, 47 in the southern hemisphere, and near the equator and ecliptic 12.

Constellations in astrology:

Just as some ethnic groups in East Asia define a person's zodiac according to the animals represented by the year of birth, in many countries, a person's birth month corresponds to a constellation.

Birth constellation comes from astrology, trying to explain people's character and destiny by using their birthplace, birth time and celestial position.

The birth month corresponds to the sun constellation as follows. Because the orbit of celestial bodies is different from the Gregorian calendar, the difference between different years will be 1-2 days, which is consistent with the distance between "solar terms" in the twenty-four solar terms of the China lunar calendar. The calculation of solar term time is accurate to minutes (not midnight), which is also the boundary of the constellation and changes every year.

Constellation name ecliptic time (general cognition) Star time Lunar solar terms correspond to the constellation time of the sun.

Aries March 21-April19 April15-May15 April19-May 13 Spring Equinox-the day before Grain Rain.

Taurus April 20th-May 20th May/KOLOC-0/June/KOLOC-0/May/KOLOC-0/April-June/KOLOC-0/9 Grain Rain-the day before Xiaoman.

Gemini may 21-June 21June1June-July1May June 20-July 20, Xiaoman-the day before the summer solstice.

Cancer June 22nd-July 22nd July16th-August15th July 2nd1Sunday-August 9th-the day before the heat.

Leo July 23rd-August 22nd August/KOOC-0/6th-September/KOOC-0/5th August/KOOC-0/0th-September/KOOC-0/5th-the day before the summer heat.

Virgo August 23rd-September 23rd, September1June-June 65438+1October1May September1June-June 65438+1October 30th, the day before the summer-autumn equinox.

Libra September 24th-65438+1October 23rd 65438+1October 6th165438+1October 5th 65438+1October 30th 365438+/.

Scorpio 65438+/KOOC-0/October 24th-/KOOC-0/65438+/KOOC-0/October 2nd/KOOC-0/Day 65438+/KOOC-0/October/KOOC-0/6-65438+February/KOOC.

Ophiuchus-165438+1October 30th-65438+February 65438+July-

Sagittarius165438+1October 22nd-65438+February 2nd165438+February 16-065438+ 10/4.

Capricorn 65438+February 22nd-065438+1October 19 065438+ 10/5-February14 065438+1.

Aquarius 065438+1October 20th-February18February1May-March1April-March1June-March1the day before the great cold.

Pisces February/KOOC-0/9-March 20th March/KOOC-0/5-April/KOOC-0/4 March/KOOC-0/2-April/KOOC-0/8 Rain-the day before the vernal equinox.

This is just a timetable. 12 constellation generally refers to the 12 constellation of the zodiac (zodiac time), that is, there is no Ophiuchus.

So the constellation is calculated according to the Gregorian calendar (solar calendar) of the year of birth.