Thithernathasya kramasinjanee hathaa khamadhya

lagnaprabhavena sankunaa kshamaashadangkaabhi

saraankanethrahrud vilambane syaad ghatikaadi vaa phalam.

  R sine of the hour angle at the amavasya multiplied by R sine of the altitude of the meridian ecliptic point and divided by 2954961 gives the parallax in ghatikas at mid eclipse (Sishyadhi vruddhi Tantra 6-8)]]>