## Eratosthenes experiment

• March 21st, 2017 : The Eratosthenes experiment

How to measure the circumference of the Earth?

Suscribe the experiment on    http://eratosthenes.ea.gr/

and watch this video to have mathematical explanations !

That's great ! Thanks to Gordana for this nice idea !

CROATIA

21st March 2017 - by the way it is an International Day of Persons with Down Syndrome

(that's why we have the picture with different socks)

Weather ... excellent and sunny

Latitude: 45.339537 / Longitude: 16.9727611

Solar noon: 11.59 h (GMT+1)

Stick length = 100cm / Stick's shadow length = 100cm --> angle = 45°

Distance from the Equator = 5037.53km

Circumference of the Earth = 40 300.24 km

We have also cooperated with school from Wroclaw/Poland (teacher: Anna Bukiewicz-Szul) and here are their results:

Latitude: 51.11 / Longitude: 17.013

Stick length = 100cm / Stick's shadow length = 123.3 cm --> angle = 50.95°

Distance between two schools: 642.63km

Circumference of the Earth = 38 881.82 km

Interesting: Spring is in the air ... there were many, many bees in the tree behind students :)

FRANCE (March 21 st, 2017)

The french students participated in this experiment too.

We were very lucky : the sun appeared 10 minutes only before we started our measurements, and it disappeared 10 minutes after we finished !!!