The Principle and Structure of the Gyupyo(Gnomon) of King Sejong's Reign in Choson Dynasty

Details The Principle and Structure of the Gyupyo(Gnomon) of King Sejong's Reign in Choson Dynasty The Principle and Structure of the Gyupyo(Gnomon) of King Sejong's Reign in Choson Dynasty

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jass...23..289l&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 23, no. 3, 289-302

Astronomy and Astrophysics

Astronomy

1

Gyupyo (Gnomon), King Sejong, Yeongbu

Scientific paper

For a reconstruct draft of the Gyupyo (Gnomon) in King Sejong Era, we collected a lot of documents of the Choson Dynasty. With the result we made a reduced model by 1/10 and drawing set for the Gnomon in Sejong Era. It is composed of the Gyu, Yongpyo, Hoengryang (a beam), Yeongbu and granitic prop. You can read the scale where the shadow of vertically-standing stick touches the horizontal Gyu. A Shadow-Definer (Yeongbu) was used to focus the shadow cast by the sun's center, measuring the (gnomon) shadow length precisely. A Yeongbu is made of a leaf of copper in the middle of which is pierced a pin-hole for the tiny optical image of the sun which tilted to face the incident sunlight, used the principle of the a pin-hole camera and Scheimplug principle.

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