Are the twelve constellations calculated according to the birth date of the lunar calendar or the solar calendar?

Are the twelve constellations according to the lunar calendar or the solar calendar?

What is the solar calendar? Gregorian calendar, also known as Gregorian calendar or new calendar, is an internationally recognized date calendar. From an astronomical point of view, it is a calendar calculated according to the annual movement of the sun, with 365 days in a year. According to the operating cycle of the direct point of the sun, the general calendar year is tropic, and there are two kinds of calendar years, one is a normal year, the other is a leap year, and the leap year is only one day away from the normal year. This kind of solar calendar is universal all over the world, so it is also called solar calendar.

The origin of the constellation is Babylon, one of the four ancient civilizations in China. At that time, they divided the sky into different regions and called them "constellations", which is the origin of constellations. Then the Babylonians made a long-term observation of these "constellations", determined the ecliptic through constant observation, and finally divided it into twelve parts, so the "zodiac signs" appeared. The end result is that the zodiac signs are named after each other. Starting from the vernal equinox, counterclockwise is Aries (Aries), Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius (Sagittarius), Capricorn, Aquarius (Aquarius) and Pisces.

So because birthdays in the western world are calculated by the solar calendar, constellations still have to be calculated by the solar calendar. And your sign is the place where you were born when the sun passed through the zodiac, and that is your personal sign.