Is beginning of spring calculated according to the new calendar or the lunar calendar?

Beginning of spring-This is the "solar term" of the lunar calendar. In other words, as long as we talk about beginning of spring, we mean the Lunar New Year. So it must be calculated according to the lunar calendar. It doesn't matter if you insist on setting the date of the Gregorian calendar as "beginning of spring". I only know that this is according to the lunar calendar.