Calendar in Ryukyu

The royal court of the Kingdom of Ryûkyû maintained its own calendars based on ones received from the Ming and Qing Empires. In the early modern period, the court also maintained awareness of Japanese (Tokugawa shogunate) calendars, so as to correctly coordinate dates with Kagoshima and Edo officials.

Okinawa received formal calendars from China every year, but, since the sunrise & sunset, and divisions of the solar year (the seasons) were different in Okinawa, there was a difference from time in Beijing. Therefore, the court created its own calendar, based on the Chinese one. From 1718 onwards, this Ryukyuan calendar was called senjitsu tsûsho 選日通書.