Welcome to Defender Canada! 
Weems & Plath Star Finder - 150 Item # 887617
Description
The Weems & Plath Star Finder graphically portrays the altitude and azimuth of the fifty-seven numbered stars in the Air and Nautical Almanacs. Additional celestial bodies may be plotted on the star base.
Features:
- Special diagrams permit rapid check of hour angle
- Provides a means of finding the altitude and azimuth of unplotted bodies
- Find identification of unplotted bodies from known altitude and azimuth
- Diameter: 8.5"