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    Re: Elements of the navigation triangle
    From: David Pike
    Date: 2018 Oct 29, 02:01 -0700

    Steve Bryant You wrote:
    Is it true that the Co-latitude and the Co-latitude will always be less than 90°? Is it true that the Co-declination may be either less than or greater than 90°?

    Steve
    I always though co meant 90° minus.  If you’re using co-lat in the PZX triangle, then P and Z must be in the same hemisphere.  If X is also in that hemisphere, then you need co-dec, which will be less than 90°.  If X is in the opposite hemisphere, why not keep it simple and call the third side 90° + dec (which will be more than 90°)?  Then you don’t have the problem, or am I way off beam?  Wrt altitude, let's not visit the case of X being below the observer's horizon. DaveP

       
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