Your personal Ming Gua (personal trigram) is derived from your birth year, revealing the four directions that support you and the four to handle with care.
Eight Mansions uses the solar (Gregorian) year. Births in late Jan / early Feb may belong to the previous lunar year — we adjust at Lì Chūn (~Feb 4).
Optional — stand inside looking out the door (or sit at your desk) to gauge the direction.