The Observatoire Royal de Belgique

	The Carte du Ciel enterprise
A brief historical account	The Astrographic Catalogue	The sky charts

Although initially not involved in the enterprise, in 1906 it took over the +39° to +32° zone for the Carte du Ciel. The zone had been originally assigned to the Potsdam Observatory whose Director, H.C. Vogel, in 1904 decided not to even start taking the long-exposure plates.

The majority of the charts (i.e. 500) were published before 1935. The charts also indicate the plate numbers.

Charts held at INAF-Osservatorio Astronomico di Palermo

zone+33°
zone+35°
zone+37°
zone+39°

References:

C. Bigg, La Carte du Ciel vue de Potsdam, in: La Carte du Ciel, ed. by J. Lamy, EDP Sciences, 2008, p. 142-144.

I. Chinnici, La Carte du Ciel, Observatoire de Paris/Osservatorio Astronomico di Palermo, 1999, p. 393-397.