Are we talking tables???
I found this Carr Lane "Trigonometry Tables and Handy References for Engineers".
I found the 21 degree page, looked under the 'M' column for 33, looked across to the Cosine column and found the value .93010, not .9315.
Does that 'M' by any chance stand for 'minutes'. Can I work in decimal degrees?? Whats the difference?? Is conversion between minutes and seconds, and decimal degrees, possible????
By the way, is it Hours, Minutes, Seconds? Not sure about the Hours part....