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한영호 ( Young Ho Hahn ),이은희 ( Eun Hee Lee ) 연세대학교 국학연구원 2012 동방학지 Vol.159 No.-
Soon after the compilation of Chiljeongsan-naepyon (七政算內篇) in 1444, some parts of Joseon`s first domestic calendar system were revised and improved during the reign of King Sejong. Several arithmetic formulae were modified to make the prediction of the eclipse simple and convenient. The frequent and onerous recourses to the bulky ready reckoning tables were phased out of the calculation procedure owing to the new formulae invented by Joseon mathematical astronomers. All the contents of improvement were reflected in the Book of Explanations and Exercises for Eclipse Prediction, Gyosikchubobeob Garyong (交食推步法假令), which was published in 1458, the fourth year of King Sejo`s reign. The first part of this article reports on the details and effectiveness of the newly dev ised a rithmetic to calculate the following six i tems: the expansion/contraction difference of the sun, the slackening/hastening difference of the moon, the addition/subtraction difference for eclipse correction, the sunrise/sunset parts of a day, the corrected extent motion degrees at the eclipse maximum, and the lodge positions on the Red/Yellow Way. The rest of the article deals with the meaning and the origin of the newly defined formula for addition/subtraction difference used to obtain the corrected time of the conjunction and the full moon. It attracts remarkable attention because the angular speed of the moon relative to the sun was considered for the first time in the long history of East Asian calendars, in the denominator of the formula for the addition/subtraction difference for eclipse correction. Moreover, some concern was paid to explain how and why King Sejong`s point of view on the results of eclipse prediction had changed generously during the progress of establishing his own calendar from Chinese systems.
한영호(Hahn Young ho) 국립고궁박물관 2007 古宮文化 Vol.- No.1
Details of star map and surrounding inscriptions on King Taejo s astronomical chart, Cheosnag yeolchahun yajido, were analyzed to clarify its origin, construction era of original copy, planispherical aspects of old and revised star maps, and correction of culminating star list. Many records and data were found from the old documents to prove and support Kwon Geun s epilogue that refer to the existence of original star chart in Pyeongyang. The most probable era of original construction is estimated to be the mid-7th century of Koguryo. The descriptive parts of the star chart were uncovered to be quoted from the astronomical chapters of Jinshu, and the celestial planisphere was disclosed to be engraved on the basis which the star catalog collected by Chen Zhuo and the star map of the Kaihuang Gaitu might have provided. Nevertheless, it is evident that the star chart had become of Koguryo style by adding a special constellation into the Heavenly Marketplace on the map and informal marks at the points of spring equinox and winter solstice on the ecliptic circle. The positions of the stars were compared to show the scope of revision during King Taejo s re-inscription. Apparent displacements limited to the stars near the north pole and first mansion Gakshu indicate that partial amendment on star map was carried out during the reconstruction. The list of the culminating stars in the morning and evening was calculated to verify that the astronomical bureau Seoun gwan had revised it totally to a new one.