Crowd-sourced experiment to measure the SIZE OF THE EARTH

[technicalfool]

I'll let that infamous Youtube firebrand Thunderf00t explain it:

If anybody is interested, you basically need a stick, a ruler and a camera. A smartphone or tablet with a time-lapse app would be even better.

[PakledHostage]

The late, great, Carl Sagan describing how Eratosthenes calculated the size of the Earth in about 200 BC. Just how accurate his estimate was is a topic of debate, but it was certainly better than Ptolomy's later estimate of about 29000 km.

Edited June 24, 2013 by PakledHostage
fixed a spelling mistake...

[kahlzun]

"Help me June 22 2013"

Looks at calendar, says "25th June"

I think you've missed the boat here, technicalfool