Based on natural concepts of a document as an information object, the questions of document identification, concepts of the instance, copy, and original are studied, along with accompanying concepts of the registry, catalogue, and repository.
Nous racontons d'abord l'histoire des catalogues stellaires en la divisant à trois ǎpoques selon les instruments utilisés pour achever le travail: 1° l'époque de l'alidade munie de pinnules et de la clepsydre, 2° l'époque du cercle méridien et de la pendule sidérale et 3° l'époque de l'équatorial photographique. Nous montrons le fait que beaucoup de découvertes importantes de l'Astronomie sont obtenues de la compilation des catalogues stellaires. Nous passons en revue des catalogues import...
For four years(1951—54)time determination data,after allowed for personal equation and referred to the mean observatory which is formed by the International Time Office(B.I.H.),seasonal fluctuation with amp- litude equals to 25 ms is found.That is,the clock corrections observed at Zi-Ka-Wei Observatory seem larger in May while smaller in February and July as compered with their annual mean. The Δ(α_α) type error of the fundamental catalogue(FK_3)contributes to the seasonal fluctuation with an amount o...
A statistical analysis of 132 supernovae discovered from 1885 to December 1963 according to the types of galaxies in which they appeared and the types of supernovae is given.The following conclusions concerning the correlation between supernovae and types of galaxies and the relative frequency of supernovae are obtained. 1.The majority of observed supernovae appeared in normal and barred spirals (S and SB),among which 4/5 exploded in the former and the rest occurred in the lat- ter; 2.The supernovae appeari...