Longines Lindbergh Hour Angle Watch

In the mid-1930s, the Longines-Wittnauer watch company marketed a line of watches designed in collaboration with Charles Lindbergh and P. V. H. Weems. The Hour Angle Watch sped computations for determining celestial lines of position. Its bezel and dial allowed navigators to read off the hour angle of a celestial object at Greenwich, eliminating a simple but troublesome calculation.

Caption:
The Linbergh Hour Angle Watch eliminated a simple but troublesome calculation in celestial computations.
Type: Artifact
Image Date: January 4, 2013
Credit: National Air and Space Museum, Smithsonian Institution
Origin: National Air and Space Museum, Smithsonian Institution
Creator: Eric Long
NASM2013-00137
Innovations
Navigation Methods
 
The Linbergh Hour Angle Watch eliminated a simple but troublesome calculation in celestial computations.
The Linbergh Hour Angle Watch eliminated a simple but troublesome calculation in celestial computations.