Airy Transit Circle

Airy's transit circle.
View full size imageAiry's transit circle. © NMM
Look through the window where the Line enters the building. On the Line you will see the Airy Transit Telescope. This telescope has defined the Greenwich Meridian since 1851. In 1884 the Greenwich Meridian was adopted as the Prime Meridian of the world. Before 1884 different countries measured east and west from different places, for example the French measured from Paris, while the Spanish measured from Cadiz.
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Trail Printable version of this trail
Stories Greenwich and the story of time