Calculation
Moon longitude - Sun longitudeelongation1 Thithi12°1 Karanam6°Total in lunar month60 karanam slots
Karanam is half of a Thithi. One karanam equals 6° Moon-Sun angular distance.
There are 11 karanam names. Seven repeat many times, and four are fixed near the end of Krishna Paksha.
The Panchangam Karanam card shows how much of the current 6° karanam has completed.