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The sundials produced in King Sejong era had the functions of accurate observation instruments and were fabricated in\udvarious forms such as Angbuilgu (hemispherical sundial). In this study, we investigated the literature, structural characteristics\udand principles of Hyeonjuilgu, Cheonpyeongilgu and Jeongnamilgu that were developed in Joseon to have the\udunique structures. Additionally, the sundials were reviewed in the perspective of technical history by comparing them\udwith the sundials of China. For the restoration of the sundials, we identified the principle in which the light spots and\udshade of the sun were used, and drew the variations of the altitude and azimuth by the yearly motion of the sun on the\udSiban on the hemispheric and flat surfaces. Based on these results, we completed the design drawings of the three sundials\udand proposed the restoration models

A Study for the Restoration of the Sundials in King Sejong Era