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The Prime Meridian of Florence at 11 15' East of Greenwich

The hexadecimal Prime Meridian, the meridian of Gabon, transits the centre of Firenze.

It crosses the Arno River between the Ponte alla Carraia and the Ponte Santa Trinita.

 

Florence meridian.jpg

Sources :

The topographic map N 275.1 edited by the I.G.M. (Italy) 1:25 000,

 

confirmed by regional vectorial maps N 275030/40 scale 1:10 000.

But  slightly eastwards  according to Google Earth.  New measures in high-level accuracy are required.