Thingiverse
Davis Sextant to Celestaire Bubble Artificial Horizon Adapter by Biketool
by Thingiverse
Last crawled date: 3 years ago
Print at (10% at scale)Press fit adapter for Celestaire Practice Bubble Horizon AKA artificial horizon to fit Davis Mk12, Mk15, and Mk25 plastic sextants. The alternative is to purchase a very expensive commercial navigators sextant, using a bowl of water or puddle sun reflection, or buying(or printing https://www.thingiverse.com/thing:2123500) folding water box for reflecting the sun which Davis actually sells for inland practice. Cost is an important consideration now that a sextant is mostly a backup and hobby tool replaced in frontline navigation by GPS. Requires no boresighting or adjustment of either the sight, tube, or sextant as the bubble will always gravity align itself with the horizon line in the artificial horizon. Get the bubble horizon here https://www.celestaire.com/sextant-accessories/practice-bubble-horizon-detail.html
Just a FYI this is not a straight walled tube, one side fits the Sextant properly and the other fits the bubble sight.
An artificial horizon sight is required for celestial navigation any time a good sea horizon is not viewable due to weather, terrain, or an inland location; you do need to know your altitude above sea level though by either a map, survey mark, or properly adjusted altimeter; use air sextant altitude correction tables when above mean sea level. This initially incompatible sextant and artificial horizon combination when joined together with this adapter forms the most affordable off-the-shelf inland, airborne, and bad weather celestial navigation tool currently available. Use the instructions for an air sextant if you are using an altimeter and above/below sea level.http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0012
The Celestaire sight uses a horizontal slit to force proper eye alignment, this makes it less useful than a two axis bubble sight for shooting smaller stars after dark. Don't be concerned that the horizon side of the mirror is blocked by the bubble, you now align the the center of the bubble with the horizon line then adjust the sextant to allign a celestial object to the black line as you would with the sea horizon, it is a bit more work to allign three objects than the regular sun and horizon. Continue to use sun filters for both mirrors as required.
The Celestaire bubble horizon should still work on full size sextants with fork mount sights it was designed for while this adapter is installed.
This adapter printed in ABS has been in use for several years without any problems.
Just a FYI this is not a straight walled tube, one side fits the Sextant properly and the other fits the bubble sight.
An artificial horizon sight is required for celestial navigation any time a good sea horizon is not viewable due to weather, terrain, or an inland location; you do need to know your altitude above sea level though by either a map, survey mark, or properly adjusted altimeter; use air sextant altitude correction tables when above mean sea level. This initially incompatible sextant and artificial horizon combination when joined together with this adapter forms the most affordable off-the-shelf inland, airborne, and bad weather celestial navigation tool currently available. Use the instructions for an air sextant if you are using an altimeter and above/below sea level.http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0012
The Celestaire sight uses a horizontal slit to force proper eye alignment, this makes it less useful than a two axis bubble sight for shooting smaller stars after dark. Don't be concerned that the horizon side of the mirror is blocked by the bubble, you now align the the center of the bubble with the horizon line then adjust the sextant to allign a celestial object to the black line as you would with the sea horizon, it is a bit more work to allign three objects than the regular sun and horizon. Continue to use sun filters for both mirrors as required.
The Celestaire bubble horizon should still work on full size sextants with fork mount sights it was designed for while this adapter is installed.
This adapter printed in ABS has been in use for several years without any problems.
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