Hello, Sorry if this is not the right place but I'm trying to find this for days now... I'm trying to find a working formula to determine the position (r.asc/decl) of a star at any given time and for a specific location on earth. So the parameter would be: R. Asc. of the star Decl. of the star Long. on earth Lat. on earth Date Hour And the result would be R. Asc. of the star Decl. of the star (EDIT: I forgot the Long/Lat parameters ;-)) Thanks!