Cook's delight 2

The sphere (below) familiarised Captain Cook with the constellations - and is well worn from years of his use - but it was also accompanied by this detailed star atlas with inclinations and considerable precision - all overlaided by imaginative artists representations of the constellations.

Sending this from my iPhone, as its precise GPS location guides me back to the hotel from the library, with Google Earth with its detailed star charts, accompanying Google maps, it is humbling to remember just how little information these intrepid early navigators had. Brave...