图、书之数本为星宿，可从天地两个角度索解。在天分阴阳，阳数为四时太阳位置，阴数为月亮位置，同表历法；在地分刚柔，星有分野方位，表水土州分，地数星宿分野恰为《周礼·职方》四正方位。合而言之，“天地之数”表四时五方。 Figure, the number of books for the stars, from two perspectives on the world. In the talent of the yin and yang, the sun is at four o’clock position of the sun, the moon is the location of the moon, with the calendar calendar; in the soft ground, the stars have different positions, surface water and soil points, Square “four positive position. In other words, ”the number of heaven and earth" table four or five.