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Celestaire's Practice Bubble Horizon allows the user to effectively practice taking sights without having a natural (sea) horizon, and without spending hundreds of dollars for a Professional Bubble Horizon.
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. It differs from the more expensive professional bubble horizon in that it is not as accurate, is unlighted, and has less light gathering capability.
Recommended for the CELESTAIRE PRACTICE BUBBLE HORIZ