Eratosthenes

Lafrançaise, France

June 2007

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Lafrançaise France Collège Antonin Perbosc 44.127 1.238
Date Gnomon Shadow Angle
June 01 100 cm 40.2 cm 21°54’ = 21.900°
June 15 cm cm 20°45’ = 20.750°
June 18 cm cm 20°40’ = 20.667°

Location : In the south-west of France countryside (3.000 inhabitants) . 17 km from Montauban (50.000 inhabitants), 70 km from Toulouse (650.000 inhabitants)

Grade and/or Subject Area 12 students from 10 to 15 years old, of the astronomy club of the school are working during the lunch pause. The solar noon is calculated from an ephemeride.

01/06/2007

15/06/2007

Summer solstice week :

measurements with the gnomon and the quadrant. Useful length of the gnomon: 882mm, which is also the radius of the quadrant. (precision +/- 00°05’)

Our blog is http://eratostwin.blogspot.com/

18/06/2007

Summer solstice:

videoconference with Alexandria Library (Egypt) on june 21st to commemorate Eratosthenes measurement. Angle of sun: 20°40’ = 20,667°
Partner: tropic of Cancer(Angle of sun: 00°00’, Distance to Lafrançaise: 2298 km)

What we do differently the next time? We worked too much time on the 2006-2007 European project at http://www.mapmonde.org/eratos . Next time, we shall try to be more active for the springtime equinox on NoonDay Project.

Conclusions - What we learned from our participation? Thank you to Ihor. This is a great planetary project !. Hello Alexandria !


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