Eratosthenes 2010-2011

The day of the equinox is on saturday, and the students are not at school, what can I do?

Wednesday 3 March 2010
  • The Equinox Day is Saturday, 20 March 2010, and some of you will not be at school that day. You can estimate the outcome of the measurement date with two other measures. Examples:
  • Le jour de l’équinoxe est le samedi 20 mars, et certains d’entre vous ne seront pas à l’école ce jour là. Vous pouvez faire un estimation du résultat de la mesure de ce jour avec deux autres mesures. Voici des exemples :
  • El Día Equinox es sábado, 20 de marzo, y algunos de ustedes no estarán en la escuela ese día. Se puede estimar los resultados de la fecha de medición con otras dos medidas. Ejemplos:

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As we could not make any measurement on march 20th, we experimented on 15th, 16th and 19th.

Date Gnomon Shadow Angle
march 15th 100 cm 104.5 cm 46.26°
march 16th 100 cm 103 cm 45.85°
march 19th 100 cm 98.5 cm 44.57°
march 20th 100 cm ????? ?????

Then we we made a graphic interpolation to have an estimation of the result for 20th march.

JPEG

  • Gnomon : 100 cm
  • Shadow : 97 cm
  • Angle : 44.13° = 44°10’

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