Jookaku is a lightweight cultural reflection tool. It is not a full BaZi calculation.
It uses a February 4 approximation for Li Chun, derives the birth-year animal and heavenly-stem element, adds a broad birth-season prompt, and creates an original numerological rhythm for entertainment.
It does not calculate exact solar-term time, location adjustments, lunar-calendar conversion, Four Pillars, luck pillars, or professional predictions. Birth place is not requested because it is not used.