What are the two days of double spring in 2023?

The double spring in 2023 is February 4, 2023 and February 4, 2024.

Double spring year refers to two solar terms in beginning of spring in a year. The double spring year is a unique phenomenon in China's commemorative calendar, which is actually caused by the "error between the solar calendar and the lunar calendar"

The traditional calendar in China is a combination of yin and yang: "Yin" means that the calendar month is based on the new moon (with an average length of 29.5306 days), and the new moon is the first day of each month; "Yang" means that its calendar year is basically based on the Tropic of Cancer, and the first day of the first month (that is, the Spring Festival) is the first day of the first month around the annual "beginning of spring".