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    Re: Reliable Index Correction to a Tenth Minute of Arc
    From: Greg Rudzinski
    Date: 2010 Feb 18, 12:29 -0800


    It is a good idea to check index error before a series of sights to make sure you are reasonably close to the expected index error. Unknowingly jostling the horizon mirror is easy to do. I would strongly recommend checking index error before and after each observation when using any model of plastic sextant. Checking a metal sextant for index error should be done each time it is removed from the box for confirmation and confidence. Be careful not to try to constantly adjust errors to achieve zero index error because this leads to the loosening of the adjustment screws. If the adjustment screws get loose then any little knock will throw everything off.

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