Beidou (Northern Dipper)

The seven bright stars that the West calls the Big Dipper or the Plough are, in the Chinese sky, Beidou, the Northern Bushel: a grain measure with a long handle, swinging around the pole through the night and through the year. The Han astronomical treatises give the asterism a role no Western reading of these stars ever carried.

The Records of the Grand Historian describe the Dipper as the carriage of the sovereign of heaven, which wheels about the centre and governs the four seasons, and Han texts preserve the observation behind the metaphor: at the same hour of the evening the handle points east in spring, south in summer, west in autumn and north in winter, so the Bushel is a clock face written on the circumpolar sky. Because the seven stars never set from Chinese latitudes, they were permanently available, to farmers as a season marker, to travellers as a pointer toward the pole, and to the state cult as the visible regulator of time itself.

The asterism sits within the Purple Forbidden Enclosure's district of the sky, adjacent to the palace it serves. This atlas keeps Beidou as its own entry, in the Chinese register, alongside the Great Bear of the Greek sky and the Foreleg of the Egyptian one, because the same seven stars carry three genuinely different figures, and the Bushel is the one that tells time.

In Daoist religion the Northern Dipper is not a figure of speech but an object of cult. From the Han period onward, texts and liturgies address the seven stars, sometimes with two invisible attendants making nine, as the bureau that holds the registers of human life: the Dipper records the allotted span, and rites directed to it petition for errors in the ledger to be corrected and the span extended. A famous tale type makes the contrast explicit, pairing the South Dipper, who registers births, with the North Dipper, who registers deaths, and showing a young man winning years back by serving the two star lords at their chess game. Liturgical practice took several forms that the scholarly record describes openly: recitation of scriptures of the Northern Dipper, lamp rites laid out in the pattern of the seven stars, and the pacing of the Dipper, a ritual walk whose steps trace the asterism, attested from early medieval texts onward.

The Dipper Mother, Doumu, presides over the constellation in later Daoism and still receives offerings on her feast day in Chinese temple religion. The atlas records these facts about the cult and does not transmit its liturgies. One distinction matters for any reader of Chinese sources: Dou among the twenty eight lunar mansions is the Southern Dipper in Sagittarius, a different asterism entirely from Beidou.