NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Modris Fersters
Date: 2023 May 30, 22:31 -0700
Dear Lars!
The values in the certificate excatly matches the values derived from excentrity formula (except value at 70°, which may be simply misprinted). The difference between certificate values and calculated values are less than 1” (see the table below) . It seems to me the values in the certificate were calculated prom P and 2E rather than measured directly.
Main arc angle / Value in the certificate / Calculated value
10° 5” 5,7”
20° 11” 11,5”
30° 17” 17,4”
40° 23” 23,4”
50° 29” 29,5”
60° 35” 35,5”
70° 36” 41,3”
80° 47” 47,2”
90° 53” 52,8”
100° 58” 58,2”
110° 63” 63,4”
120° 68” 68,3”
I don’t understand how you got these 0,1’(6”) differences at 30°, 50°, 80° and 110°.
Modris Fersters
