What is the specific time of the twelve constellations? (For example, Leo (BC 10970 ~ BC 88 10)) occurs every 2 160 years?

Judging from the semantics of the landlord's two questions, the question should be "the time of the vernal equinox in the zodiac/zodiac". The landlord should have learned from relevant channels that the vernal equinox is retrogressive, with a period of 25,800 years and a retrogression of 50.26 seconds every year. So at different times, the position of the vernal equinox is different, and the change from quantitative accumulation to qualitative change is the change of his constellation.

Next, we need to continue to sort out two terms, one is constellation and the other is astrological palace. The former is a rigorous term in astronomy. 1928, IAU officially demarcated the boundary of the constellation, and then there was no boundary problem. The latter is a cultural concept, which is divided into sections every 30 degrees from the vernal equinox and named after nearby constellations (of course, this general cultural concept will have many problems compared with reality. For example, in ancient Greece, there was not much difference between the positions of the star palace and the constellation, but with the accumulation of precession in two thousand years, the vernal equinox has retreated more than 30 to the west. For example, Aries counts one month from March 2 1, but it is embarrassing for the sun to run in Pisces during this time, but it does not prevent most online articles from defining March 2 1 to April 20 as Aries Palace.

So there are two ways to understand the landlord's problem. If the question is "the time of vernal equinox in each zodiac", I'm sorry I can't give a clear answer to this question. Because the spring equinox is almost out of Pisces now, most online articles still count the first month after the spring equinox as Aries instead of Pisces. As for how to draw this concept in the future, it is hard to say what the positive result will be (after all, it is network culture, so it is good for everyone to be happy). The concept put forward by the landlord is a possibility, such as setting a base point to start dividing the zodiac into twelve equal parts. The advantage of this is that the position of the zodiac can basically match the constellation, but the corresponding problem is that the time corresponding to each zodiac changes every year (so it is not necessarily feasible).

However, if the question is "when is the vernal equinox located in each zodiac", then there will be a very clear and accurate answer to the year (I will use astronomical software to query the specific time later), which will not be much different from the general division of the landlord. However, due to the size of the constellations, the proportion on the ecliptic and other reasons, the time when vernal equinox is at the boundary of each constellation will be different from the value obtained by bisection. In addition, there are actually 13 constellations on the ecliptic, besides the well-known 12 constellations, there is also Ophiuchus, so this table will naturally list 13 constellations (Scorpio only accounts for 7 eclipses, while Ophiuchus accounts for 2 1 ecliptic, which is three times that of Scorpio. A plausible statement is that Libra was originally a part of Scorpio (Scorpio's pliers), but later it split into two constellations. In order to keep the number of constellations unchanged, one constellation has to be kicked out, and Ophiuchus will suffer.