Star catalogues
نویسندگان
چکیده
منابع مشابه
Magnitude systems in old star catalogues
Abstract. The current system of stellar magnitudes first introduced by Hipparchus was strictly defined by Norman Robert Pogson in 1856. He based his system on Ptolemy’s star catalogue ‘Almagest’, recorded in about 137 A.D., and defined the magnitude-intensity relationship on a logarithmic scale. Stellar magnitudes observed with the naked eye recorded in seven old star catalogues were analyzed i...
متن کاملMagnitude systems in old star catalogues
Abstract The current system of stellar magnitudes first introduced by Hipparchus was strictly defined by Norman Robert Pogson in 1856. He based his system on Ptolemy’s star catalogue ‘Almagest’, recorded in about 137 A.D., and defined the magnitude-intensity relationship on a logarithmic scale. Stellar magnitudes observed with the naked eye recorded in seven old star catalogues were analyzed in...
متن کاملSurvey of long-term variability of stars I. Reliability of magnitudes in old star catalogues
The comparison of visual magnitudes of stars compiled in old materials is expected to yield informations about their long-term magnitude variations. In seven old catalogues whose philological studies were finished, the sampled stars amount to 2124 except for stars that we could not identify, double stars and known variables. Comparing seven old materials each other, the independency of catalogu...
متن کاملMetadata and data catalogues
Geospatial data, or data tied to a location on the Earth, are critical to solving today’s complex environmental, economic, and social problems. The use of GIS technologies for analysing spatial problems has become pervasive and, in the process, has created a demand for vast amounts of digital geospatial data. To meet that demand, the data that describe the characteristics of geographical space ...
متن کامل-catalogues systems: modified
The growing popularity of the World utilize Internet services as means of maximizing their profit by promoting products and services. Electronic commerce, which is also known as e economic environment in which business activities, such as purchasing products and advertising goods, are performed by using electronic communications. Web interface design is an important ‘pull factor’ in ecan be det...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 1885
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-6.144.408