Re: log tan calculations on a pocket calculator

[Gordon T. Uber]

Tony,

tan 25 deg = 0.46631
log (tan 25 deg) = -.33133 = 9.66867 - 10.0

Also, be careful of log base 10 vs. log base e,  e = 2.71828...

Gordon


At 20:05 97/06/24 +, you wrote:
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?

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Re: log tan calculations on a pocket calculator

[Richard Langley]

On Tue, 24 Jun 1997, Tony Moss wrote:

 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 25ƒ as  9.668 673  Can I use my

9.668 673 = 10 + log tan 25 degrees; i.e., 10 + (-0.331327)

Does that help at all?

 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


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