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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2017 Mar 7, 03:46 -0800
Dear Alexandre, thanks for the clarification.
Right now I use the DIY "ghost ring" with a 16mm diameter aperture. The aperture center is sort of aligned with the clamping screw - this is how I understood the Greg's sketch.
What are the recommended diameters of a ghost ring and a "zero magnification tube"?
Regarding the possibility of viewing the combined image from the wrong angle - this must be the cause of unexpected and spontaneous changes of the overlap/contact I experienced while making a "lunar" - all of a sudden a kissing Moon-Venus become a massive overlap, and then back to touching limbs - without me adjusting the angle (as Frank suggest I hold the sextant by its' frame both hands). I must have been slightly swaying the sextant in front of me...
Please comment.
Regards,
Tony
