Hello Declan,
Greetings from Nova Scotia. Your "dodgy" math is essentially correct
and the reverse of how mariners have calculated their latitude from the
sun's position and noon.
Fortunately, there are a number of good online calculators that will do
all the math for you
[SNIP trying to keep Kawrence happy]
http://solardat.uoregon.edu/SunChartProgram.html
Enjoy!
Calum
[SNIP!]
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