La comète de Halley, découverte en 1682 lors de son passage à proximité de la Terre, revient tous les 76 ans. Cite les années où elle est passée près de la Terre depuis 1682.
En quelle année sera-t-elle de nouveau visible de la Terre ?
Lors de ce rituel, les élèves doivent tenter de résoudre un problème donné.
La démarche de résolution et la compréhension du problème donné compte plus que le résultat.
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