Brihat Parashara Hora Shastra
ओजत्वेन समत्वेन सयातीये उभे यदि। तर्हि संख्ये योजयीत वैजात्ये तु वियोजयेत्॥ १३॥
If the latest product in this process is an odd one, count so many Rāśis from Mesh in a direct manner; if an even one, count so many Rāśis from Meen in reverse order. The Rāśi so known will be the Varnad for Lagn.
english translation
ojatvena samatvena sayAtIye ubhe yadi। tarhi saMkhye yojayIta vaijAtye tu viyojayet॥ 13॥
hk transliteration by Sanscript