As a dial maker and reluctant 'number cruncher' I use computer spreadsheets for all my calculations but have had to rely on my old printed six-figure tables for one remaining job - the log tan values in the sun's azimuth calculation.
e.g. My printed tables give the log tan of 25° as 9.668 673 Can I use my Casio fx 85s Scientific pocket calculator to achieve this result or do I need a special type of calculator? No combination of keystrokes I've tried produces anything like that figure and, like Pooh Bear, "my brain is starting to hurt". What am I doing wrong? Hoping someone out there can offer guidance with a 'mystery sundialling gift' as a 'thank you' for the first correct solution!! Tony
