00566nam a22001097a 4500020002100000082001700021100002000038245008100058260005200139300003500191650023000226  a9679690091 (pbk)  a529.327bILY  aIlyas, Muhammad  aA modern guide to astronomical calculation of Islamic calendar times & Qibla  aKuala LumpurbBerita Publishing SDN. BHD.c1984  axvii, 255 p.b: ill.c; 25 cm.  aCalendar, Islamic-TablevAstronomical coordinate systemvNatural time reckoningvSidereal time vSpherical trianglesvOrbital motionsvPosition determinationvLunar calendarvTechnical detailsvRadiation detectorvIslamvIIMC