Measuring the size of the Earth

Some pictures

Lekki expressway: heavy rain at the beginning of our day
Lagos lagoon: our trip to the Boat Yard
Vivian's Beach Hut at Eleko Beach: we synchronize our watch
We start with the measurements
Initial measurements: at regular interval we put a new stick in the sand to mark the current position of the ping-pong shadow. The single stick to the right marks the position of the vertical projection of the ping-pong ball.
We continue to measure...
The last stick is stuck in the sand
Finally we measure the distances between each stick that marks a position of the shadow and the single stick that marks the vertical projection of the ping-pong ball
We give a final check to our notes
At the Lagos Yacht Club: we start to put our data in order with the assistance of Charlotte and Dick
Riccardo shows us how to plot the data
Charlotte, Vivian and Veronica assist while we plot the data
Finally we draw the curve of best fit over our data
... and Vivian refines it with a last touch