----- Original Message -----
Sent: Friday, October 14, 2011 5:10
AM
Subject: solar time calculator
Not sure what I’m doing wrong
I wrote a program so that I can set my watch to solar
time.
Something is wrong. Either my program is wrong or my
sundial is inaccurate.
To use the program
Set your computer accurately to clock time
Run the macro ‘recalc’. This will make the clock on your
computer display on the spreadsheet in real time. This will also input today’s
date. This date will lookup the EOT and either add or subtract the time
Set your watch to solar time
The purple cell is for troubleshooting. 1 = add the eot
values (positive or negative). -1 will subtract these values. Once I figure
out which one to use, it will be true for all days. At the moment, neither
work
My objective is to make a solar compass that will work for
my area only
I’ll simply rotate the sundial that I designed with
longitude correction until it agrees with my watch that I set to solar
time.
I understand that the EOT has accuracy problems. However, I
thought it was accurate enough for what I want it for. I’d like your feedback
on that. I’d also like your feedback on whether or not my goal is realistic in
spite of the accumulation of small errors such as eot, sundial accuracy,
gnomon placement and gnomon perpendicular to the dial
--
Cheers
Donald
0423 102
090
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So there!
