Originally Posted by Capt.Don
Thanks - I've always been curious about doing this with trig formulas!
Don, it really is pretty easy.
Often I use both methods of determining Hc & Zn- calculator and HO 249 for the Latitude I'm in.
It's alot easier to print out the HO 249 Latitude sheets
you'll typically find yourself in than having the entire book.
In my case I'm in Latitudes N39, N40 and N41 so all I require is about 6 sheets
double side printed.
I want to avoid using electronics
as much as possible when doing Sextant
work....including the calculator. But, as mentioned before they too are useful tools.
Also, HO 249 only covers up to Declinations of 29 degrees so you can't use that for many stars. I'm certainly not going to carry HO 229. Thus, using a calculator to get Hc and Zn for stars above that declination is necessary. So, again, you won't have lug around a lot of paper.