A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2017 Dec 12, 13:17 -0800
Here is another Kamal Project. All that is needed is a dollar store tape measure, solar film, scotch tape, and a slide rule. This project was inspired by a YouTube video posted by Douglas Hendricks.
To use the tape measure to directly read degrees for low altitude Sun observations - tape solar film behind the 10 cm mark, bend the tape at the 20 cm mark and draw to 30 inches from eye. Observe the Sun center through the solar film at the 10 cm mark and read degees of elevation where the horizon passes through the tape. Will work up to 9°.
For Polaris observations - bend tape measure at 10 inches and trombone the tape measure under the eye such that the top of the tape is at Polaris and the horizon is at the 10 inch mark. The trig will be the inverse tangant of 10/ (Draw reading in inches minus 10 inches). The trig is easily done by slide rule by placing the left index over the draw sum then read off Hs of Polaris on the T scale above the right index.