Astronomy and Space + Pure Mathematics
Measure the Earth's circumference like Eratosthenes
Measure a stick's shadow at local noon in two cities and calculate the size of the Earth.
- Intermediate
- 1 day
- Free
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Observe the sky, track satellites and model orbits with your eyes, a phone or free data from space agencies.
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Astronomy and Space + Pure Mathematics
Measure a stick's shadow at local noon in two cities and calculate the size of the Earth.
Astronomy and Space · Planetary Science
Measure shadow lengths in a high-resolution Moon image and estimate the height of a crater rim.
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