A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2015 May 2, 12:19 -0700
I agree with Robert Bernecky that wolframalpha.com is probably the best place for you to find somewhat exotic calculation tools. Here's a link to his example again.
But now that you have lots of ideas, I have to ask the big question. You wrote originally:
"For Navigation purposes I need to transform radians into degrees with at least 16 significant digits (and - better - if possible to 20 or even 24 significant digits)."
Why? Are you navigating at Angstrom-level precision on the Earth? Measuring the distance from New York to Paris to the nearest atomic diameter? That would require 17 significant digits. Are you navigating across the Milky Way Galaxy at centimeter precision? That would require 24 significant digits. Clearly not... You don't need extended precision for any practical navigation problem, right? You don't even need double precision (16 digits). For normal celestial navigation, if you can convert degrees to radians and back with 7 significant digits, then you've got all the precision you need and some to spare. And that level of precision, of course, is available in nearly every handheld or online calculator.