 Another area of potential Ru interest in astronomy is calendrics, based on detailed observation of seasonal changes. One example is the Monthly Ordinance (Yueling 月令) calendars of the Huainanzi. Monthly Ordinances use Five Agents correlations to specify the correct social, ritual, and agricultural activities for each season. Rulers could use these texts to regulate state ritual activities over the course of the year. The ordinances cover such topics as state activities (fortification, planting, etc.) and the consequences of performing activities at incorrect times. These are the first texts in the received tradition to link the twenty-eight Lunar Lodges to the months of the year, associating each month with a lodge, which indicates the position of the sun among the stars for that month. (Ancient Chinese astronomers divided the celestial equator around the pole star into twenty-eight “lodges” (xiu 宿), each named by a star within it and each comprising some 13 degrees (du 度) of the circle.) The calendric tables list the days of the year in stem-branch sexagenary order, with annotations on the nature of different kinds of days, and which days were auspicious or inauspicious for particular activities. (Such calendars also appear in almost identical form in the Guanzi and Lü Shi chunqiu, and were incorporated into the Li ji in the Later Han dynasty. See Guanzi, chs. 3.8 and 3.9, Rickett 1985, 148–192) They also included monthly and seasonal correlates. For example, the lodges were associated with the position of the sun, and dusk and dawn correlated to the five pentatonic tones, pitch pipe notes, numbers, tastes, smells, color of the emperor’s clothing, presiding deity, and yin and yang sacrificial organs, all described in terms of the Five Agents (Major 1993, 220–225).