How many constellations are there in a year?

A * * * has twelve constellations, as follows: Aries: March 2 1 to April 19 Taurus: April 20 to May 20 Gemini: May 2 1 to June 2 1 Cancer: June 22 to July 22 Leo: 65438+1October 24th ~165438+1October 22nd Sagittarius:165438+1October 23rd ~ 65438+February 2nd/kloc-0. The extended data from March 20 to March 20 are the same in ancient astronomy and astrology: the ancients observed the sky and astrology, hoping to understand the alternation and change of seasons by watching stars to determine the date of sowing, and also hoping to predict human floods, droughts, storms and military events by divination astrology. At this time, "calendar" and "astrology" are mixed together and cannot be completely separated. For a long time in human history, astronomers and astrologers were once the same person, whether in the East or the West. Gander, an astronomer in China during the Warring States Period, wrote a book Astronomical Astrology, and Zhang Heng and Li and his party in the history of China were also big stars. Ptolemy, Tycho, Kepler and other great astronomers in ancient western countries were also great astrologers. At that time, there was no boundary between astronomy and astrology.