... Положения космических аппаратов вычисляются по теории SDP4/SGP4 ( http://ecco.bsee.swin.edu.au/chronos/metsat/spacetrk.html ). ... Элементы орбит находятся на сайте http://www.celestrak.com/NORAD/elements/ . ...
... stars (see also the description of the catalogs provided for A.A. Volchkov's visualization code we used at www.simfov.ru ... Washington, 1997). 13. A. A. Volchkov and O. A. Volchkov, http://www.simfov.ru, 2001.. ...
... Below, we give a list of the major catalogs and other data sources used, roghly in the order of our preference in identifying variable stars (see also the description of the catalogs provided for A.A. Volchkov's visualization code we used at www.simfov.ru ...