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Observational accuracy of sunrise and sunset times in the sixth century China
Li, Yong
2006
发表期刊CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
卷号6期号:5页码:629-634
摘要The Daye Calendar was compiled in AD 597 in the Sui Dynasty. We investigate the records of sunrise and sunset times on the 24 solar-term days in the calendar. By converting the ancient Chinese time units, Chen, Ke and Fen to hour, minute and second, and carrying out a comparison between the ancient records and values computed with modem astronomical theory, we find that the accuracy of solar measurements in the Sui period is remarkably high: for sunrise times, the average absolute deviation is 3.63 min (this value can be further reduced to 3.03 min when erroneous data are excluded), and for sunset times it is 3.48 min. We also find that the observed sunrise and sunset times are strictly symmetrically distributed with respect to both the Winter Solstice and the Summer Solstice, with their deviations showing a similar symmetrical distribution as well. We give a discussion on the date of observation, the feature of the data, and possible reasons of the deviation.
关键词History Of Astronomy Astrometry Solar-terrestrial Relations Methods : Statistical
收录类别SCI
语种英语
WOS记录号WOS:000241487800016
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8940
专题应用天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Li, Yong. Observational accuracy of sunrise and sunset times in the sixth century China[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2006,6(5):629-634.
APA Li, Yong.(2006).Observational accuracy of sunrise and sunset times in the sixth century China.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,6(5),629-634.
MLA Li, Yong."Observational accuracy of sunrise and sunset times in the sixth century China".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 6.5(2006):629-634.
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