94
T
Obteryatien at AleutnAna
Obtervoticn at Syt A
FAST
VP* 777
Alexandria Syeoe
«stik.
The earliest known measurement of the earth's circumference was made
bv Eratosthenes about 240 b.c. His calculations were based on 1 the
angular height of the sun and (z) the linear distance between .Alexandria
and Syenê.
