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    Re: Mirror horizon
    From: Art Leung
    Date: 2023 Sep 6, 07:50 -0700

    I had built something similar to this many decades ago using a round first surface mirror of 6" diameter on a substantial piece of glass - memory is fading but I think it was 3/8" or 1/2" thickness to the glass.  I put it on a piece of triangular plywood with a leveling screw in the corners.  I used a fairly good bullseye bubble level on it but it was insufficiently accurate for the purpose and my accuracy was a bit indifferent.

    On the plus side, it did allow me to shoot stars.

    Given the relative effort, I'm very much a fan of having the bubble inside the sextant.

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