Birthdays and horoscopes are calculated according to the lunar calendar (solar terms are the most important). Festivals and Qi are two concepts. For example, the beginning of spring in the first month is a festival, and rain is Qi. Only after the beginning of spring can it be regarded as the beginning of the year and the beginning of the first month. (This is the algorithm of birth date and horoscope).
Constellations are calculated according to the Gregorian calendar. (January 20---February 19 is Aquarius, February 20---March 20 is Pisces, March 21---April 20 is Aries. April 21---May 20 Sun is Taurus; May 21st-June 21st is Gemini, June 22nd-July 22nd is Cancer, July 23rd--August 23rd--. -September 22 for Virgo. September 23---October 22 for Libra. November 22---December 21 for Sagittarius. 22---January 19 is Capricorn.
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