The Carte du Ciel enterprise

The Paris Observatory

It was assigned the zone +24° to +18, but it made heliogravures only for the +18, +20, + 22, +24 zones.

 

The Paris Observatory

( image from the site http://www.actuacity.com/paris-14e-arrondissement_75014/monuments/page3)

Charts held at the INAF-Osservatorio Astronomico di Palermo Library:

 

Donatella Randazzo, 6 November 2012