Rung 1: Size of the Earth
Eratosthenes (~240 BC)Historical Context
Eratosthenes heard that in the city of Syene, the sun shone directly down a well at noon on the summer solstice, casting no shadow. In his own city of Alexandria, a vertical rod cast a shadow.
The Mathematics
$$ C = \frac{360^\circ}{\theta} \times s $$
- $C$: Circumference of the Earth
- $\theta$: Shadow angle difference ($^\circ$)
- $s$: Distance between cities (km)
Raw Data & Controls
Adjust the variables based on the Observatory simulation to match reality and calculate the result.
Your Calculation ($C$):
0 km