BTA Apparent Place to/from FK5 coordinates transformation. (based on procedure published at IAA A.Y. and on IAU SOFA library) . Coordinates( J2000 ): . ... 100 m a : . sec/century) . ... arcsec/century) . for FK5 epoch) . ... arcsec) . ... AP (current moment) .. J2000 (FK5) Get AP(current coordinates) from BTA TCS . ... Mean Sidereal Time: 18:26:1.181 (Apparent=18:26:0.946) . ... J2000) 00:00:00.000 +00:00:00.00 ...