The Astronomical Instrument, So-Gahui Invented During King Sejong Period

Details The Astronomical Instrument, So-Gahui Invented During King Sejong Period The Astronomical Instrument, So-Gahui Invented During King Sejong Period

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jass...19..231l&link_type=abstract

Journal of Astronomy and Space Science, vol. 19, no. 3, p. 231-242

Astronomy and Astrophysics

Astronomy

2

Astronomical Instrument, So-Ganui, King Sejong

Scientific paper

So-ganui, namely small simplified armillary sphere, was invented as an astronomical instrument by Lee Cheon, Jeong Cho, Jung In-Ji under 16 years' rule of King Sejong. We collect records and observed data on So-ganui. It is designed to measure position of celestial sphere and to determine time. It also can be transformed equatorial to horizontal, and horizontal to equatorial coordinate. It can measure the right ascension, declination, altitude and azimuth. It is composed of Sayu-hwan (Four displacements), Jeokdo-hwan (Equatorial dial), Baekgak-hwan (Ring with one hundred-interval quarters), Gyuhyeong (Sighting aliadade), Yongju (Dragon-pillar) and Bu (Stand). So-ganui was used conveniently portable surveying as well as astronomical instrument and possible to determine time during day and night.

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