Are the zodiac signs and constellations determined by the solar or lunar calendar?

The zodiac signs and constellations are determined according to the solar calendar.

The formulation of constellation comes from the west, and there are corresponding dates on the Gregorian calendar, which should be very clear, needless to say. The zodiac was changed in beginning of spring (not the Spring Festival), so it is also determined according to the solar calendar.

In addition, the traditional calendar in China is not scientifically called lunar calendar, but a combined calendar of yin and yang, which is divided into two parts, one is the month and the other is the 24 solar terms. There are real lunar calendars in the world, such as the Islamic calendar, which is twelve months a year and twenty-nine or thirty days a month. A year is not 365 days. And our lunar calendar has thirteen months, with an average of 365 days.