One image featuring Andromeda constellation. Part of a folio of celestial maps "laid down to the Gnomonic Projection: they are projected on the map in perspective: that is as they would be at a given moment by a Camera Lucida... The distinguishing feature of it is, those stars which are in the same straight line, are still in the same staight line in the map, which gives great facility in finding any particular star. The distance of a star from the centre of the map, measured in the direcion of the equator..."
Constellation on far left is the sea monster Cetus, also called "whale."
