Sea Horizon instaling12/29/2023 ![]() A reading is then taken and the time noted in the normal manner. The sextant is held such that the bubble appears alongside the hairline (as shown), and the celestial body is brought down to the hairline by movement of the micrometer drum. The right side is divided by a horizontal hairline. The right side admits a view of the outside world as reflected by the sextant's index mirror (when using a whole horizon mirror, a horizontal view is also seen superimposed). An ordinary spirit level is reflected by a mirror to appear upright in the opaque left side of the scope. The scope is of zero-magnification, and is mounted on the sextant in place of the regular telescope as shown above. ![]() It differs from the more expensive professional bubble horizon in that it is not as accurate, is unlighted, and has less light gathering. ![]() With this, you can use the same sextant you will take to sea, and use it in a normal manner to take sights from your backyard. At long last, here is a way to effectively practice taking sights without having a natural (sea) horizon, and without spending hundreds of dollars for a Professional Bubble Horizon. ![]()
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