Word origin · etymology
Tamil poruttam (பொருத்தம்), a match or fit, with an astrological sense.
Wiktionary lists, among the senses of the Tamil word, the astrological one: favourableness or agreement of horoscopes of the two parties to be married. The English spellings porutham and poruthams are transliterations.[3]
How we know · epistemology
A classical rule list applied by counting
Each consideration is a rule about the nakshatra or sign of the two Moons and can be checked; the translation read is a scan with slips, some of its lists differ from Raman's, and where it does not define a case the page marks the consideration as not assessed. That at least five should agree is the text's own rule, not a measured threshold.[1][2]
Connected concepts
Sources & provenance
The numbers in the text point to this list; it distinguishes a calculation convention, a historical teaching and an editorial example.