Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rnaoj...5..145k&link_type=abstract
Report of the National Astronomical Observatory of Japan, Vol. 5, No. 4, p. 145 - 159 (2002)
Astronomy and Astrophysics
Astronomy
2
Astronomical Records, Earth Rotation, Solar Eclipses, Lunar Eclipses
Scientific paper
Records of solar and lunar eclipses and occultations of stars in the Nihongi have been investigated to show their usefulness in answering questions about the long term variability of the Earth's rate of rotation. Results show that reliability of these records depend on the volume of the Nihongi and records in β group of volumes in the classification by H. Mori based on Chinese characters employed as phonetic letters, i.e. Vol. 22 (Empress Suiko), Vol. 23 (Emperor Jomei), and Vol. 29 (Emperor Tenmu), are highly reliable for these studies. Studies of solar eclipses recorded as total eclipses in the Nihongi and the Suishu and an occultation of Mars recorded in the Nihongi show that good agreements can be obtained between descriptions in these Japanese and Chinese historical books and calculations when we adopt TT-UT=3000 sec with correction for tidal term -2.0"/cy2 in the 7th century. Descriptions of solar and lunar eclipses recorded in Vol. 24 (Empress Kogyoku) and Vol. 30 (Empress Jito) are not based on observations but on theoretical predictions. All records of comets, aurorae, volcanic explosions, earthquakes, and tsunami in the Nihongi are described in β group volumes.
Kawabata Kin-Aki
Soma Mitsuru
Tanikawa Kiyotaka
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