How to use the sextant / stadimeter ??

[quink99]

Unless I'm mistaking, a common occurance, then;

Position error when measurering celestial bodies: +- 120 sm ( = +- 1° error) or more

.....is in error.

There are 60 sm (see miles are the German version of nautical miles and the same as nautical miles) to one degree, thus, 120 sm equals two degrees , not one degree.