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    Ebbco Intercept Data using Davis Artificial Horizon
    From: Greg Rudzinski
    Date: 2019 Mar 5, 12:48 -0800

    Attn: Michael Bradley.

    Attached is an intercept data set using an Ebbco with a x3 optic and a Davis artificial horizon. The observations are all sunlines using solar film to shade the direct sun and the orange and blue sun filters provided by Davis for the artificial horizon reflected sun. Weather conditions were very good. No LOPs thrown out. Index error checked before and after each observation. Arch error corrected for carefully.  

    Results are quite good for a plastic sextant but keep in mind that any residual systematic errors will be halved when the artificial horizon angle is divided by 2. There is no dip correction so no dip uncertainties or horizon refraction uncertainties. 

    Greg Rudzinski


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