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The card catalog was a familiar sight to library users for generations, but it has been effectively replaced by the online public access catalog (OPAC). Some still refer to the online catalog as a "card catalog". Some libraries with OPAC access still have card catalogs on site, but these are now strictly a secondary resource and are seldom updated.
Online public access catalog. The online public access catalog ( OPAC ), now frequently synonymous with library catalog, is an online database of materials held by a library or group of libraries. Online catalogs have largely replaced the analog card catalogs previously used in libraries.
The Tycho-2 positions and magnitudes are based on the observations collected by the star mapper of the European Space Agency 's Hipparcos satellite. They are the same observations used to compile the Tycho-1 Catalogue (ESA SP-1200, 1997). However, Tycho-2 is much larger and a bit more precise, because a more advanced reduction technique was used.
Seznam.cz. Seznam.cz (or Seznam, list in Czech) is a web portal and search engine in the Czech Republic. Founded in 1996 by Ivo Lukačovič in Prague as the first web portal in the Czech Republic. Seznam started with a search engine and an internet version of yellow pages. Today, Seznam runs almost 30 different web services and associated brands.
The Mercedes-Benz E-Class is a range of executive cars manufactured by German automaker Mercedes-Benz in various engine and body configurations. Produced since September 1953, the E-Class falls as a midrange in the Mercedes line-up, and has been marketed worldwide across five generations. Before 1993, the E in Mercedes-Benz nomenclature was a ...
1:24 scale model of the Ford GT, at rear, behind 1:32 and nominal HO models, illustrate the traditional slot car scales. 1:24 scale is a size for automobile models such as injection-molded plastic model kits or metal die-cast toys , which are built and collected by both children and adults. 1:24 means that a unit of measurement, such as one ...
Guide Star Catalog. The Guide Star Catalog ( GSC ), also known as the Hubble Space Telescope, Guide Catalog ( HSTGC ), is a star catalog compiled to support the Hubble Space Telescope with targeting off-axis stars. GSC-I contained approximately 20,000,000 stars with apparent magnitudes of 6 to 15. GSC-II contains 945,592,683 stars out to ...