Throughout the entire Joseon Dynasty, sundials were widely used as time-measuring instruments. Various existing sundial artifacts prove this fact. The standard form of the Joseon Dynasty sundial was established during King Sejong’s reign. Various sundials, including the Angbuilgu(仰釜日晷), were produced, and astronomical instruments with sundial functions such as the Ganui(簡儀), Soganui(小簡儀), Ilseongjeongsiui(日星定時儀), and Soilseongjeongsiui(小日星定時儀) emerged. Sundials were essential to state operations as they, along with clepsydras, played a crucial role in royal rituals and various national ceremonies. In the case of sundials produced during the Joseon period, there is a noticeable asymmetry between the existing artifacts and related historical records. For the Angbuilgu, where relatively many artifacts exist, related historical records are rare. Conversely, for some sundials with relatively more historical records, existing artifacts are rare. Therefore, to gain a comprehensive understanding of sundials from the Joseon period, it is necessary to clarify their principles through structural analysis of existing artifacts while concurrently re-examining the remaining historical records diachronically. This article attempts to reorganize historical records related to sundials of the Joseon period, focusing on the manufacture and use of sundials in the late Joseon period, particularly the Ilseongjeongsiui and the Jipyeongilgu(地平日晷).