EQAlign
http://eqalign.net/e_eqalign.htmlhttps://www.youtube.com/watch?v=P2adx6B7Lf8EQAlign is a project that assists to align a German Equatorial Mount (GEM) exactly to the Earth polar axis.
The method used is that of Julius Scheiner (1858-1913) german mathematic, physic, astronomer and pioneer in astrophotography.