Eratosthenes' observation on 20 June 2013
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En partenariat avec |
On 20 june 2013 : Solstice celebration with Eratosthenes
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This event aims at a simple measurement which allows to determine the circumference of the Earth: Eratosthenes's measurement.
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Eratosthenes then measured in Alexandria the angle between the sun and the vertical. Then, knowing the distance between the two cities and assuming that, on Earth, the sun rays are parallel, he could set the earth's circumference. |
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The measurement
2200 years later, we are going to reproduce the observations of Eratosthenes with our partners. The event in Lyon is mainly dedicated to pupils of primary and secondary schools. The students have to come with their teacher and the device they prepared for the measurement.
In the ENS de Lyon, the measurement will take place at 13h43 HLF
Ephemerides
The 20 of June's videoconference
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From 11:00 UTC to 12:00 UTC (13h00-14h00 Legal time Egypt-Spain-France)
Videoconference with the biblioteca Alexandrina and the Colegio Luis Buñuel, Alcobendas, Madrid
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Classes who want to participate in this videoconference have to
1) Register on the Lamap website "Following in the foosteps of Eratosthene"
2) Send an email to charles-henri.eyraud(at)ens-lyon.fr, replacing (at) by @, with some details:
School : Name, Direction, Country, Latitude, Longitude. Age and number of students involved
Other measurements will have been done the previous days (17,18, and 19 June), and could be used for the videoconference
Other observations in the garden of the ENS de Lyon
- Observation of sunspots
- Observation of sun's corona
Participants will also be given the opportunity to make drawings of the sun and its spots as did Galileo. A drawing competition will be organised for scientific and artistic appreciation.
Help for calculations
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