Ancient Traveller
By observing stars our ancestors were able to keep track of time and predict seasonal changes. This also helped them to navigate around earth.
Our ancestors use sun to navigate around sea during the day. And during night they look at the stars for guiding them. They track various constellations in the sky to navigate. Greeks knew the earth was round and the exact circumference and diameter of the earth.
2500 year ago Greek mathematician Eratosthenes discovered the earth was round with the help of two sticks. By the experiment he proved the earth was round and measured the diameter of earth.
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