Speed of light walk

Walking and hiking route Dromos - Walking and hiking route Speed of light walk

Owner: Dromos
Region: Ile-de-France • Hauts-de-Seine • Paris • Neuilly-sur-Seine • Suresnes
Linked groups: Science
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Speed of light walk

The Speed of light walk is a walk following the beam of light which was used by Hyppolite Fizau. He measured the speed of light very accurate in 1849, by measuring the reflected beam of light from Montmartre to Suresnes.

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Statistics

General difficulty level

General difficulty score: 90/100.

Easy Difficult

Difficulty level in detail

Total ascent: 221 m
Difficulty level (relative): 9/10

Max. slope (base 500m): 8.93 %
Difficulty level (relative): 9/10

Length: 12.4 km
Difficulty level (relative): 8/10

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Places of interest (along the route) (show all)

Montmartre (distance from start: 0.07 km/0.04 miles)

Montmartre
18ème Arrondissement Paris
On this hill, a mirror was placed to allow the measurement of the speed of light by Fizaeu, in 1849.

Mont Valérien (distance from start: 12.41 km/7.71 miles)

Mont Valérien
Suresnes
From the Mont Valérien, Suresse, the French physicist Fizeau projected a lightbeam towards a mirror at Montmartre. Interposed in the path was a rapidly spinning cogweel with 720 precisely machined teeth. The beam would be exclipsed if the spin of the wheel was going faster. From this, Fiezau could calculate the speed of light as 315 400 km/sec. This was 1849!

Places of interest (near the route)

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Practical locations nearby

  1. Café Les deux moulins
  2. Café Anglais
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