Praguna paridhe: sathaamsako ganithajnaa:

kathayanthi drusyathe prathi bhaathi thadaa samaa mahee

vishaye yanthra thathaiva gamyathe

  Mathematicians say that one hundredth of the cirucumference of the earth appears to be plane. So, that portion of the earth appears to be plane to an observer (Sishyadhi vruddhi Tantra 20-35)]]>