The library of Eratosthenes

Arras (FRANCE)

2006 by astro.perbosc

school : Ecole Lafontaine
city : Arras
country : France
address : rue Lafontaine
postal code : 62000
latitude : 50°17’ N = 50.283°
longitude : 02°44 ’ E = 2.733°
year : 2006

  Table of contents  

 2006, september 28



On September 28 we measured the hour and the length of the shade. With 13:45 the shade of 123cm was smallest. It was the hour of solar midday.
With the height of the gnomon and the length of the shade, we found an angle of 51° At the time of the equinox, this angle is equal to the latitude.

 2006, december 21




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