also: おんみょうりょう · おんようのつかさ · うらのつかさ
Bureau of Onmyō; government office for astronomy, divination, and calendar-making
Historical term for a bureau under the ritsuryō system that handled astronomical observations, divination, and calendar creation.
The Bureau of Onmyō was a government office responsible for astronomy and calendars under the ritsuryō system.