Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jass...21..505a&link_type=abstract
Journal of Astronomy and Space Sciences. Vol. 21, no. 4, 505-528
Astronomy and Astrophysics
Astronomy
2
System Of Hours, Lunar Occultation, Historical Astronomy
Scientific paper
We have reproduced the records of lunar occultation recorded in the History of Three Kingdoms, the History of the Koryo Dynasty, the Annals of the Choson Dynasty, the Daily Records of Royal Secretariat of the Choson Dynasty, and obtained the epochs of their realizations. We analysed these results to understand how the system of hours had been kept and when a day began. During most of the periods encompassed by these annals, the 12 double hours and the system of 100 divisions of the day had been used when the lunar and the solar eclipses were calculated by royal astronomers. In these systems, the starting point of a day is midnight. On the other hand, the five watch system of hours, in which a night is divided into five watches, was also used. In this system, a day begins at the sunrise. We found that the traditional twilight, called dusk and dawn and used in the east Asian countries, largely corresponds to the nautical twilight in modern concepts. This fact means that the Korean expressions and words for time system in every day life had originated from the five watch system of hours. We pointed out that the sunrise and sunset were convenient boundary lines to ancient astronomers, as well as to farmers in the agricultural society. Our results can be used to determine the exact epoch of each astronomical record in chronicles.
Ahn Sang-Hyeon
Park Jong-Woo
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