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    Re: Quartz article: reinstating celestial...
    From: Geoffrey Kolbe
    Date: 2015 Oct 19, 17:46 +0100




    On Mon, Oct 19, 2015 at 3:57 PM, Jackson McDonald  wrote:

    See photo. I'm not convinced that taking a sight through a glass window would be a good idea. Wouldn't the glass refract the image and introduce some additional error to the sextant reading?


    ​So long as both sides of the 'glass' window are parallel (or pretty close) then the light will come out of the glass at the same angle it went in - or close enough for government work....

    Geoffrey​
     

       
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