The Canon Sinuum was a historic table of sines thought to have given the sines to 8 sexagesimal places between 0 and 90 degrees in steps of 2 arc seconds.
Johannes Kepler called the Canon Sinuum the most precise known table of sines.
The Canon Sinuum was computed by Bürgi's algorithms explained in his work Fundamentum Astronomiae presented to Emperor Rudolf II.
[3] The largest trigonometrical table actually contained in the Fundamentum Astronomiae is a table giving the sines for every minute of the quadrant and to 5 to 7 sexagesimal places.
The manuscript of Fundamentum Astronomiae is now in the collection of the Biblioteka Uniwersytecka in Wrocław, Poland.