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Algol에 대한 Copernicus 인공위성과의 동시지상관측
나일성,박홍서,이용삼,김천휘 연세대학교 자연과학연구소 1981 學術論文集 Vol.8 No.-
1980년 11월에 Copernicus 인공위성으로 식변광성 Algol에 대하여 극히 짧은 자외선 영역 관측이 진행되는 동안, 지상에서도 가시광 영역으로 Algol의 제1극심을 관측하는 국제공동관측망이 편성되었다. 연세대학교 천문대도 이 관측망에 포함되었고, Florida대학교의 Rosemary Hill천문대와 정보교환을 하게 되었다. 우리가 이 공동지상관측에 성공한 것은 1980년 11월 28∼29일 밤이었고, 이때 사용한 망원경은 과학관 옥상에 설치되어 있는 40-㎝ Cave 반사망원경이었으며, 제1극심시각을 정하는데 필요한 관측점 41점(B=19점, V=22점)만으로 광도 곡선을 B와 V에 대하여 각각 만든 다음, 극심시각을 각각 결정하여 평균치로 JD Hel. 2444572.0027을 얻었다. 그리고 과거 20여년동안 발표된 제1극심시각을 수집하여 O-C diagram을 그려본 결과, 1970년 이래 10년 동안 계속하여 Algol의 공전주기가 감소하고 있었고 10년간의 전체 감소량이 약 0^d.03(=43분)됨을 발견했다. A world-wide ground observation network was in operation for visible light observations of Algol, the eclipsing variable star, during the Copernicus satellite observations in the far ultraviolet region in November, 1980. Yonsei University Observatory joined the network and communicated mainly with the Rosemary Hill Observatory, University of Florida. We succeeded in observation of the primary minimum light on 1980 November 28-29 Korean Standard Time. The telescope used for this observation was a 40-㎝ Cave reflector, and with a total of 41 photoelectric observations (19 in blue and 22 in yellow) the blue and yellow light curves were drawn. With these two light curves, two times of primary minimum light of Algol were determined, out of which the weighted averageJD Hel. 2444572.0027 was found. This time of epoch together with other epochs available from the last 20 years were plotted on an O-C diagram, from which we found that the orbital period of Algol has been decreasing since 1970 and the amount of decreasing since 1970 and the amount of decrease turned out to be about 0^d.03(=43minutes).
첨성대(瞻星臺)의 사각기초석(四角基礎石)의 방향결정과 천문대로서의 기능
나일성 한국과학사학회 1981 한국과학사학회지 Vol.3 No.1
The present study is aimed at discussing two subjects which are currently hot issues among scholars. The first of these subjects is a measurement of the deviation of the structure's square foundation stone from the meridian at that place. The measured deviation turned out to be 19 degree which is even larger than previously assumed. Is this deviation really evidence that the structure should not be considered an astronomical observatory? Of course not. The reason for this is given. The second subject considered is the type of use made of the Chomsongdae for astronomical purposes. Many people are arguing that the upper enclosure of the structure does not seem to have enough space for observational work to be done. The size of the space may be too small for the use of large instruments, but too small for the use of large instruments, but the opposite conclusion would also be conceivable, if one makes the simple assumption that ancient astronomers kept a continual watch of the sky, day and night, without using any sophisticated tools. In dealing with ancient remains like Chomsongdae one should take great care not to treat them in terms of our modern scene. There exists at least a 1300 year gap between then and now!
A Study of the 1668 Deungrok, Records of Celestial Phenomena from the Joseon Dynasty
나일성,홍윤,안나미 한국우주과학회 2012 Journal of Astronomy and Space Sciences Vol.29 No.2
This paper will introduce and overview in general the Seongbyeon Deungrok issued by the Gwansang-gam, the Astronomical Board in the Joseon Dynasty of Korea. All the Chinese characters in the 1668 Seongbyeon Deungrok was deciphered at first and these were translated into Korean and English. With these translations and the word ‘white vapor’ in particular we discuss the nature of the main object in this Deungrok. Lastly, names of observers who engaged in the observations of this 1668 celestial, which are made as a by-product of this research, are introduced.
승정원일기(承政院日記)와 조선정조시대(朝鮮正禮時代)의 천문관측기록(天文觀測記錄)
나일성,Nha, Il-Seong 한국천문학회 1979 Journal of The Korean Astronomical Society Vol.12 No.1
Astronomical records in the days of King Jeongjo of Yi dynasty, 1777-1800, are examined for solar and lunar eclipses, meteors and comets. The books used for this investigation are Sung Jeong Won Il Gi, which are the original daily records written in the court. The records found in these Sung Jeong Won Il Gi are tabulated according to the four astronomical phenomena above, and they were cross checked with the records in the book, Jung Bo Mun Heon Bi Go. Although Jung Bo Mun Heon Bi Go has most frequently been used as the original records to those who work for the ancient Korean records, the inaccuracy and the deficiency are found.