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    Re: Loss of accuracy using Sun over Sun with a mercury artificial horizon?
    From: David C
    Date: 2016 Jul 18, 19:27 -0700

    A good point about measuring the sun's SD. It would give  me a quick and easy check of my measuring technique.

    The SD is currently 15.7'. My measurements were 31' upper and 31' lower. This gives an IE of 0 and a SD of 15.5'. It seems that I am measuring too low which is consistant with the intercepts.

    Of course it could be the sextant that is at fault. I do not have a certificate for it.

    Further sights will have to wait.  There is thick cloud with a cold southerly and rain outside. We have just lit the wood burner and I am not worried about my position, a luxury that the ancient mariners did not have.

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