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    Clear side of horizon mirrors has reflecting properties.
    From: Bob GW
    Date: 2020 Oct 14, 02:28 -0700

    I'm a self taught celestial navigator so my education may have holes, but when I look through my sextant I can see both the image and reflection of the celestial object easily through the clear glass half of the horizon mirror. The clear glass has reflecting properties. It's easier to see the horizon and the celestial object simultaneously than to have the celestial object on the mirror side and the horizon on the clear side. Also at the line where the mirror meets the clear glass on my Astra IIIb knock off (GLH130-40), the interface is partially silvered acting as a half mirror. This truly allows both reflection and transmitance at the same mirror location. In the various references I've read, I haven't seen any mention of this. Is this common knowledge, but no one seems to mention?

       
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