Manasara 6.31

6.31

yuvatyāmādidaśake divase nāṅgulaṃ bhavet
madhye caikāṅgulaṃ tyaktvā cāntyapaṅktau dvayāṅgulam

in Virgo, in the first ten days, there are no digits; / in the middle, discarding one digit; and in the final ten-day period, two digits;