Is the constellation based on the lunar calendar or the solar calendar, a twelve-star constellation?

The twelve constellations are in the west, and there is no lunar calendar in the west, only the solar calendar, so it is calculated according to the solar calendar.

Aries (March 21-April 20)

Taurus (April 2 1- May 2 1)

Gemini (May 22nd-June 2nd1)

Cancer (June 22-July 22)

Leo (July 23-August 22)

Virgo (August 23-September 22)

Libra (September 23rd-65438+1October 23rd)

Scorpio (65438+1October 24th-165438+1October 22nd)

Sagittarius (165438+1October 23rd-65438+February 2nd1)

Capricorn (65438+February 22nd-65438+1October 20th)

Aquarius (65438+1October 21-February 19)

Pisces (February 20-March 20)

Extended data

The origin of western constellations:

In 270 BC, the Greek poet Aratus wrote Things, in which 47 constellations were mentioned. According to the star regions recorded in Celestial Bodies, due to precession, the Antarctic in the period described in the book is not consistent with the current Antarctic, so it can be inferred that the starry sky recorded in the book is before 2000 BC;

At the same time, the blank area of the starry sky record indicates that the observer should be near 35 to 36 north latitude. So some people think that the practice of dividing the starry sky into constellations originated from Babylon and Sumer in Mesopotamia, and the constellations of Greece and Egypt may have been introduced from this area.

In the Book of Job, several constellations such as Bear and Orion are mentioned. In the12nd century BC, the land landmarks built in the era of Nebuchadnezzar I were engraved with designs of Sagittarius, Scorpio and Ophiuchus. The ancient Greek poets Homer and hesiod also mentioned Ursa major, Orion and the Pleiades (the Pleiades was considered as an independent constellation at that time, not a part of Taurus), and at the same time, Babylon had recorded the zodiac in cuneiform.

In the second century, Ptolemy recorded 1022 stars in 48 constellations in his astronomical masterpiece, which is also the embryonic form of modern constellations. After that, many astronomers filled the Ptolemaic constellation with new constellations. Valle in 1603, Jahannes Hewelius in 1690, and Llakaj in 1752 have named the constellations in Nantian in two centuries.

References:

Baidu encyclopedia-constellation