Nautical astrolabe key ring.

This piece is a reproduction of the Dundee Nautical Astrolabe. This marine astrolabe, made by the Portuguese, dated between 1550-1555 is in the Art Gallery and Museum of Dundee, Scotland.

The nautical astrolabe is the simplification of the planispheric or astronomical astrolabe, and can only take the height of the stars and was used to calculate latitude.

Measurements:

Diameter: 45mm / Thickness: 5mm

Reference H82