Kansei Calendar, Japanese clocks and the definition of twilight

Details Kansei Calendar, Japanese clocks and the definition of twilight Kansei Calendar, Japanese clocks and the definition of twilight

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005asthe..98..373h&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 98, No. 6, p. 373 - 379 (2005)

Astronomy and Astrophysics

Astronomy

History Of Astronomy, Calendars, Twilight

Scientific paper

Edo Japan adopted seasonal time system, which divided daytime and nighttime respectively into six units. According to this time system, dawn and dusk becomes the time of beginning day and night, and it was necessary to define precisely that point of time. Kansei Calendar edited by Yoshitoki Takahashi reformulated the previous definition of the time of dawn as 2.5/100 of a day before the sunrise, and redefined it as the time when the sun falls 7 and 36/100 degrees below the horizon. The definition of twilight in Japanese calendrical system was reflected in certain Japanese clocks. The astronomical model on the top of the Ten Thousand Year Clock made by Hisashige Tanaka well represented the definition of time of Kansei Calendar.

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