Why was my constellation Virgo last year and Libra this year?

This may be related to two different ways of constellation division. In some cases, according to the classification of western constellations, Virgo is the constellation of people born between August 23rd and September 22nd, while Libra is the constellation of people born between September 23rd and 65438+1October 23rd. But in China, Virgo is usually divided into the constellation of people born between August 1 and August 20th, while Libra is the constellation of people born between August 2nd1and September 22nd. So, this may be because you use different constellation division methods.