A karana is half a tithi — the fifth limb (anga) of the panchang. One karana is completed each time the Moon moves another 6° ahead of the Sun, so each tithi has two karanas. There are 11 karanas in all — 7 chara (movable) and 4 sthira (fixed). Among them, the Vishti karana is the same as Bhadra, and it is the one karana that is traditionally avoided for auspicious work.