To calculate the Earth's circumference (and radius), you will need shadow measurements from pairs of locations, For MYW, this will be done with your Partnership in each of three locations; U.S., Chile, and Mexico. Please contact your MYW Partners through online communication or use the data lookup tool to obtain these measurements.

If for some reason, you are unable to communicate with your MYW Partners or if they have not reported their shadow measurements, please contact us at


For general help on calculating the Earth's circumference, contact