OCR Text |
Show - - One of ot the First Calcubtors Calculators CalcubtorsOver CalculatorsOver CalculatorOver * Over 2 2000 000 y ears cars ago a . learned learnod learnedGreek learnodGreek learnedGreek Greek named D'lmed Dlmed ' Eratosthenes EratosthenesJ EratosthenesJwho , who IIvod llvod IIvodIn llvodin livedin In Egypt , was W'lS WlS ' able to say roughly how howfar howfar howfar far it ss , was 'ts ts is ' round the earth earUl , althoughat althougbat althougb although at that time bme only a n small smaIl part of the the"orld thettorld th&world thworld & "orld orld ttorld " " was Isis 'lS lS ' known Lnoxsn I.no Ino . " n to him Ium By observ observ- observIng observing observing - ing the sun at t two " 0 different places In InLg InEgypt InEg Egypt Lg ) pt and measuring the distance be- be between between be between - - tween them , he calculated calcul'lted calcullted ' the circumference circum cIrcum- cIrcumference circumference - ference of the earth e1rtJ ! mathematically mathematically.and mathematicallyand , , . and was better than 80 SO per cent cor COl- COl cor- COlred correct correct - rect red , . |