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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Trombone Kamal Prototype
From: Greg Rudzinski
Date: 2009 Jun 5, 08:13 -0700
From: Greg Rudzinski
Date: 2009 Jun 5, 08:13 -0700
Frank, Thanks for your analysis. I will compare horizontal sextant angles with the Trombone Kamal for a baseline check. Greg On Jun 4, 9:30�pm,wrote: > Greg, of your observations, you wrote: > "Avg. � 4.1'T � Scatter 19.7'" > > I was going to mention that you may want to calibrate your device with some observations of objects at fixed angular separations since you can't really be sure about the baseline of your triangles to better than about half an inch. That 4.1' average error could probably be reduced a bit. > > As for scatter (the full range from max negative error to max positive error), it's not really a useful statistical measure. It's better to look at the standard deviation, which I find for your numbers is just about 6'. That's right in line with observational experiments that I've done (and seen done) with cross-staffs, which is what you've got there. So that's looking very reasonable. I doubt you could get much better in terms of statistical spread without some means of looking in two directions simultaneously; for example via the double reflection principle of the sextant. > > -FER --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---