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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 |