Twenty-two hundred years ago, the Greek scientist Eratosthenes measured the circumference of the
Earth. This paper describes an experiment to replicate Eratosthenes? experiment with observers
located in Australia and New Zealand. The most accurate circumference produced in the experiment
described in this paper is 38?874?km, measured at Rosebud, Victoria, Australia, and Jimboomba,
Queensland, Australia with an error of 2.9%. This exceeds the accuracy of Eratosthenes, although not
of the modern recreation of his experiment between Syene and Alexandria. The experiment described in
this paper might form a useful model for cooperation between schools in different countries.