Chinese Astronomy最新文献

New problems in nutation calculation 章动计算中的新问题

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90022-5

Xu Bang-xin

引用次数: 0

The hexagram “Feng” in “the book of changes” as the earliest written record of sunspot 《易经》中以“风”卦作为太阳黑子最早的文字记载

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90034-1

Xu Zhen-tao

{"title":"The hexagram “Feng” in “the book of changes” as the earliest written record of sunspot","authors":"Xu Zhen-tao","doi":"10.1016/0146-6364(80)90034-1","DOIUrl":"10.1016/0146-6364(80)90034-1","url":null,"abstract":"<div>The hexagram “Feng” of the “Book of Changes” (completed before 800 B.C.) contains the statements “a dou is seen in the Sun” and “a mei is seen in the Sun”. The character dou (bushel) is generally understood to refer to an obscured region in this context. As to the character mei, a passage in the “Biography of Wang Mang” in “The History of the Later Han Dynasty“ written in 450 A.D. shoes that it is synonymous with the character xing (star), and according to “Kaiyuan Treatise on Prognostication” written in 729 A.D., both dou and xing in this context refer to an obscuration. Lastly, in the years 1626, 1643 and 1684, years of relatively high solar activities over the period 1610–1700 (Eddy, Science<math><mtext>192</mtext></math> (1976) 1189), when sunspots were seen in telescopes in Europe (cf. Bray and Loughhead, “Sunspots” 1964, Plate 1.1), these two very same statements are found in some Local Gazettes of China (Xu Zhen-tao and Jiang Yao-tiao, Annals of Nanjing University, (Natural Sciences Series), No. 2, 1979). Thus, the earliest written record of a sunspot is found in China, in this book which was completed before 800 B.C.</div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1980-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(80)90034-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91156567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The actual accuracy of latitude observations 纬度观测的实际精度

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90023-7

Zhu Sheng-yuan, Zhao Jun-liang

引用次数: 1

Linear waves in a slowly rotating, compressible and perfectly conducting gas embedded in magnetic and gravitational fields 在一个缓慢旋转，可压缩和完美传导气体嵌入磁场和引力场的线性波

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90026-2

Chen Biao, Yin Chun-lin

{"title":"Linear waves in a slowly rotating, compressible and perfectly conducting gas embedded in magnetic and gravitational fields","authors":"Chen Biao, Yin Chun-lin","doi":"10.1016/0146-6364(80)90026-2","DOIUrl":"10.1016/0146-6364(80)90026-2","url":null,"abstract":"<div>We discuss the dispersion relation of local linear waves in a compressible and perfectly conducting gas possessing magnetic and gravitational fields in a slowly rotating frame of reference. Instead of the full energy equation and a gas law, a not necessarily adiabatic equation of state p=p(ϱ) is used to close the system of equations, — an arguably flexible way of treatment when we are not clear about the contributions by radiation and conductivity to the energy transport.We give a general dimensionless dispersion relation, (8). This reduces to (9) if the magnetic field B is zero; to (10) if, further, rotation φ is zero; to the relation for accoustic waves (11), if further the gravitational field G is zero. When B is not zero, we consider various cases with the propagation vector K always perpendicular to B: the relation now reduces to (13) if K is not perpendicular to φ; to (14) if, further, K is parallel to G; to (15) if φ=0; to the relation for last magneto-accoustic waves (16) if G=0. It reduces to (17) if K is perpendicular to G; to the fast magneto-accoustic waves (18), if, further, φ=0. It reduces to (19) if K is perpendicular to φ and to (20), if, further, K is parallel to G.Our study shows that, in general, there are no pure modes, only hybrids. In particular, a rotation gives rise to modes that are dependent on the latitude, which we call “physico-geometrical” waves.The present study is preliminary, and we may expect even more interesting results when we take into consideration the energy equation and the effects of radiation.</div>","PeriodicalId":100241,"journal":{"name":"Chinese Astronomy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1980-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6364(80)90026-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83724497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The profiles of the stokes parameters and the magnetic field vector 斯托克斯参数和磁场矢量的分布

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90033-X

Ye Shi-hui

引用次数: 0

New flare stars and variable stars in the Sco-Oph region found in 1977 1977年在Sco-Oph区域发现的新耀星和变星

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90031-6

Yao Bao-an, Huang Chang-chun, Zhang Chun-sheng, Yin Ji-sheng, Sun Yi-li, Wang Lai-cheng, Hu Qing-yu

引用次数: 0

The effect of an ellipsoidal distribution of star velocities on galactic density waves 恒星速度椭球分布对星系密度波的影响

Chinese Astronomy Pub Date : 1980-12-01 DOI: 10.1016/0146-6364(80)90032-8

Song Guo-xuan