Eratosthenes
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Monumental sundials

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Hemispheric sundial (Lafrançaise big instruments)



Quadrant gnomon (Lafrançaise big instruments)

Problème : En 2005, nous avons comparé les ombres à Arras et Lafrançaise. La comparaison était facile car nous avions un gnomon de hauteur 1m. En 2006, les écoles sur les pas d’Eratosthène ont toutes des gnomons différents. Il ne faut plus comparer les longueurs des ombres , mais l’angle des rayons (...)


Kaohsiung (Monumental sundials)



Jaipur (Monumental sundials)

Between 1727 and 1734 Maharajah Jai Singh II of Jaipur constructed five astronomical observatories in west central India. The observatories, or "Jantar Mantars" as they are commonly known, incorporate multiple buildings of unique form, each with a specialized function for astronomical (...)


Ujjain (Monumental sundials)

shift ... ctrl ... use the mouse Overview of the Ujjain Observatory taken from the east quadrant of the Samrat yantra.


Delhi (Monumental sundials)

shift ... ctrl ... use the mouse Overview of the Delhi Observatory taken from the gnomon of the Samrat yantra.


Varanasi (Monumental sundials)

shift ... ctrl ... use the mouse Overview of the Varanasi Observatory taken from the gnomon of the Samrat yantra.


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