Star or lunar mansion
Rōshuku
婁宿
A lunar mansion listed as the sixteenth of the Twenty-Eight Lunar Mansions (Nijūhasshuku). The Twenty-Eight Lunar Mansions are an old astronomical division that tracks which stars the moon appears near. Here, that division is introduced in the form of a Buddhist deity.
This introduction is based on materials from Shōhōin (Tobi Fudō). It is summarized within the scope of the beliefs and traditions those materials convey, and does not present explanations or customs common to all schools, shrines, and temples.
English pages are the site’s own translations of its Japanese pages. The sources cited are in Japanese. 日本語で読む
The name and role of Rōshuku
A lunar mansion listed as the sixteenth of the Twenty-Eight Lunar Mansions. Its Japanese name is "Tatamiboshi," and it is described as corresponding to Beta Arietis in the modern constellations.
Source: 飛不動尊 正宝院・飛不動尊 正宝院・飛不動尊 正宝院
Tracing the form and traditions
The text has columns for lucky matters and unlucky matters, showing what is suited or unsuited according to Sukuyō, but here these are treated as divisions within the tradition of divination. There is no description of its form.
Source: 飛不動尊 正宝院・飛不動尊 正宝院・飛不動尊 正宝院
Twenty-eight star divisions for reading the moon's course
The Twenty-Eight Lunar Mansions are an old astronomical division that tracks which stars the moon appears near. Seven mansions are assigned to each of four groups, east, north, west and south, which are linked with the Azure Dragon, the Black Tortoise, the White Tiger and the Vermilion Bird. They are divided differently from the Twelve Palaces, which divide the sun's path into twelve.
Source: 飛不動尊 正宝院
Star devotion preserved in calendars and images
The Twenty-Eight Lunar Mansions have been connected with judging good and bad fortune in the calendar and with the worship of stars. Shōhōin states that the forms of the mansions are not fixed and shows images based on the Butsuzō Zui. They are introduced here as historical calendar notes and beliefs, not as definitive judgments of whether today's actions are lucky or unlucky.
Source: 飛不動尊 正宝院・飛不動尊 正宝院
Related kami and buddhas
Sources (in Japanese)
- 飛不動尊 正宝院「仏様の世界：婁宿」（2026-10-14 確認）
- 飛不動尊 正宝院「仏様の世界：目次」（2026-10-14 確認）
- 飛不動尊 正宝院「仏様の世界：二十八宿」（2026-10-14 確認）
- 飛不動尊 正宝院「仏様の世界：九曜星」（2026-10-14 確認）