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    Problem shooting index error
    From: Alan S
    Date: 2019 Oct 10, 14:55 -0700

    Don't have a boat, so my efforts at “celestial navigation” are limited to shooting the sun while standing on the beach when we get down to North Carolina. Instrument used: Astra IIIB with 4 x 40mm scope that came with it, and a 7 x 35mm monocular. Shooting index error with the 4 x 40mm scope presents no problem at all. I experience difficulty determining index error with the larger scope. I assume that procedure would be the same with both, that is turning the sextant adjustment knob to achieve a continuous horizon line. Using the smaller telescope, I get a clean line, with a clear break. Cannot seem to achieve this with the monocular. Does an operational error on my part come to mind? Please advise, and thanks.

       
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