1. Find the time of the local noon at your location. Please use the web-based Solar Calculator or the Stellarium software (A short guide for using the Stellarium software to calculate your local noon at your location can be found here).
  2. Take a one-meter stick (H= 1 metre, see figure below) and place it vertically to the ground. Ask your students to measure the length of the stick to make sure it is one meter long.
  3. At the time scheduled to conduct the experiment, ask your students to measure the length of the stick’s shadow (length S in the figure below). Repeat the measurement 5 times and write their values down in the form found in the Submit Your Data area in the website (this area will be activated on the day of the Eratosthenes Experiment, 21/03/2014).
  4. Provide to the students the value for length (L)of the third side of the triangle in the picture below or ask them to calculate it themselves by using the Pythagorean Theorem . Write the value in your notebook.
  5. Calculate the distance using Google Maps between your school and the school you have matched up with. Provide the students with the value of this distance between the two schools. Write the value in your notebook.
    This year the experiment will take place on the 21st of March, on the equinox day. Thus, for your matchup –if no other schools can be found on the same longitude- you can consider the existence of a virtual school on the equator with experimental data 0 (shade of a one-meter stick measured at a certain time). This way you can also have an accurate outcome by conducting the experiment by yourself.
  6. Ask your students to calculate the circumference of the Earth and submit your value in the Submit Your Data area.


The eratosthenes2014 Experiment 2014 is organized in the framework of the Open Discovery Space project, which is co-financed by the European Commission CIP-ICT PSP- 2011-5, Theme 2: Digital Content, Objective, 2.4: eLearning Objective 2.4


Contact Persons

Dr. Angelos Lazoudis
T. +30.210.8176795
E. angelos@ea.gr

Evgenia Kypriotis
T. +30.210.8176790