Submission Guideline Abstract Sample File
Form
| Title |
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| Author 1, Author 2 |
| 1 Affiliation, Address 2 Affiliation, Address |
| (Body) We are pleased to invite you to attend the 10th International Conference on Oriental Astronomy (ICOA-10), which will be hosted in Jeju Island, Rep. of Korea on June 21-25, 2020 at The Suite Hotel Jeju. |
Example
| Structural Changes of The Sun-And-Stars Time-Determining Instrument |
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| Kim Sang Hyuk1, Mihn Byeong-Hee1,2 |
| 1Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea 2Korea University of Science & Technology, Daejeon 34113, Republic of Korea |
| We will show the structure and usage of the Sun-and-Stars Time-Determining Instrument that was first made under King Sejong (fifteenth century) during the Joseon Dynasty.It can measure solar time in the daytime and sidereal time at night. At the same time, a Simplified Sun-and-Stars Time-Determining Instrument which evolved from the Sun-and-Stars Time-Determining Instrument, simplified the graduated scale to ‘du’, not ‘fen’ in the celestial-circumference degree (that is, 365.25 du). It also got rid of the pole-fixing ring by which its instrument can be aligned to the meridian line. Lastly, the Simplified Sundial manufactured at the time of King Sejong can still be found in Korea today. This eliminated the need to measure sidereal time by removing the celestial-circumference ring and the star-dial hundred-interval ring of the Sun-and-Stars Time-Determining Instrument. We suggest that the Sun-and-Stars Time-Determining Instrument evolved into the Simplified Sun-and-Stars Time-Determining Instrument, and then the Simplified Sundial. This family of Sun-and-Stars Time-Determining Instruments was used both for timekeeping and for military purposes and in ritual ceremonies. |