The changes of seasons are astronomical events when the sun is directly above:

• The Equator on march and september equinoxes
• The Tropic of Cancer on june solstice
• The Tropic of Capricorn on december solstice

18 eTwinning schools collaborated to those astronomical events

| Andritsaina | Athens | Busteni | Cernay | Ilion 3 | Ilion 11 | Ioannina | Lafrançaise | Margineni | Mohammedia | Oradea | Petroupoli | Piraeus | Pogana | Râmnicu Vâlcea | Rhodes | Saint-Just | Úbeda |