Is birthday calculated according to the lunar calendar or solar terms?

In order to calculate the horoscope accurately, the horoscope must be calculated according to the 24 solar terms, so the intersection time of the solar terms should be considered, otherwise the constellation transportation may be arranged incorrectly, which will affect the result of constellation prediction. Take this example for example. As beginning of spring time 1998 is 1998-02-04 08:56:52 on the Gregorian calendar, 1998 on the eighth day of the first lunar month? Born at 07: 00, I haven't arrived in beginning of spring yet, so the year column arranged in eight characters is Ding Chou, not Wuyin. Please see the figure below for details of the exact arrangement of eight characters born at 7: 00 sharp on this day: