Constellation 12 refers to dividing the sky into twelve equal parts and then naming it after a constellation. To put it bluntly, the 12 constellation is not measured by the actual constellation, but by the 12 region they refer to. See what planets fall into which region at the moment of birth.
People's constellations remain the same, or according to the original 12 constellation. Because the astrological method is still tinkering with the 12 area. The 12 region is not cut according to the 12 constellation, but the 360-degree region is divided into 12 blocks from the vernal equinox. Each block is named after one of the constellations! It's naming! This is a code name! ~~~
So, everything remains the same, and the character remains the same.
If it is not Ophiuchus, but the division time of each constellation that changes slightly every year, it is not difficult to understand. 365 days a year is only an approximation, not the time for the earth to make a revolution (think about what leap years are for), so the specific time corresponding to the vernal equinox, summer solstice and autumn equinox, and winter solstice are different every year, so the time division of the two constellations is different every year. It depends on when a person was born. The time division of the year of birth is the constellation to which he is divided.
Just at the junction of two constellations, it depends on the characteristics of the other constellation.
Besides, the constellation you said only refers to the sun constellation. You can search the online astrolabe, and you can organize your personal astrolabe to see where your sun rises, where the moon is, and so on. But in astrology, the position of the planets is not the most important, and the circle (that is, some angles formed between planets) is more important. In addition, the house is also very important, and the house will be divided by the rising point ... If you talk too much, you may not understand ... Forget it, take your time, there are still many online resources.