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COMENIUS - Diaporama sur les cadrans solaires présentés par les élèves français au protugal en 2010
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COMENIUS - Diaporama sur les cadrans solaires présentés par les élèves français au protugal en 2010

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Ce diaporama présente l'histoire, les techniques, l'usage des cadrans solaires ainsi que la maquette réalisée par les élèves du collège

Ce diaporama présente l'histoire, les techniques, l'usage des cadrans solaires ainsi que la maquette réalisée par les élèves du collège

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  • 1. Written by Emma and Elise
  • 2. Collège J.J.SoulierWritten by Estelle & Eloise
  • 3. Antique sundials
  • 4. Gnomon were used in china 2000 bc
  • 5. Sundials are used since the antiquityThe first ones were invented in the 3rd milenium BC The oldest sundial from Qumram near the black sea
  • 6. In Egypt the first sundials were T shapedCe sont les Égyptiens qui ont inventéles cadrans solaires et les Romains leleur ont subtilisé
  • 7. The oldest sundial was thoutmosis s portable sundial The Caire Museum of ancient Egypt: Pharaoh Thoutmosis III in sfinx
  • 8. Romans invented the ring sundialCadran solaire en marbre du 1er ou 2e s ap JC
  • 9. Crusaders came back in europe with sundials in theirluggages
  • 10. A gnomon is a sundial :we look at the movement of its shadow on a horizontal surface.
  • 11. SummerWinter At noon time is correct. The shadow evoluates trough the seasons
  • 12. Noon is the middle of the day, between sunrise and sunset
  • 13. We split the path of the shadow in 12 parts
  • 14. Created by Charle Bloud mid 17th century
  • 15. Looking at the Sun is the oldest way to measure time. south sun westeast north
  • 16. The shadow of a stick decreases untill noon. Gnomon
  • 17. Many sundials are vertical.Shadow of stick parallel to the earth indicates,
  • 18. This angle is 90°minus the latitude of your location (44°)Stick Wall Ground North South Direction This angle equals the location latitude (46°)
  • 19. Notre Cadran solaire analemnique