A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bob Goethe
Date: 2018 Jan 18, 22:47 -0800
Thank you for this, Frank.
Let me post a followup question not just to Frank but to whoever would like to respond: I can use the Bygrave equations to calculate my initial great circle course and the distance from my current location to my destination.
Is there another equation (or set of equations) that will let me say, "If I start from a certain latitude and longitude, and travel 200 nm on a course of θ°, what will be my latitude and longitude at the end of my journey?" In a sense, I think my question is "Can I plan ahead my waypoints for a great circle route WITHOUT using a gnomonic chart?"
If a mathematical solution to this is straightforward, that would be great.
If a table-driven approach is easier, I own a Volume 2 of Bowditch (1975 edition), as well as - of course - a downloaded Bowditch 2017. If there is a table in one or both of these editions of Bowditch that will answer my question, I lack the skill to recognize that table for what it is.
Thank you all for your assistance to me.