The largest astronomy lesson involved 458 participants (all Mexico) at an event organised by Juarez Competitiva, at the Samalayuca Desert in Chihuahua, Mexico, on 14 October 2011.

Students were taught various aspects of the October nocturnal sky, including the angular size of the Constellations, the planet Jupiter and the phases of the moon. Each participant was also given instruction on how to use a telescope (each participant had their own).