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    Re: Planning a fix with >45 degrees intersection inLOPs
    From: Brad Morris
    Date: 2016 Jan 27, 00:51 -0500

    Hello Steve

    The LOP is plotted perpendicular to the Azimuth, either toward or away.  The measured altitude is compared to the computed altitude, to determine toward or away, yet this does not change the angle between LOPs, merely the intersection point.

    Thus the angle or cut between LOPs can be directly inferred from the spread in azimuths. 

    For a two body fix, try for 90° angular separation.

    For a three body fix, try for 120° angular separation.

    All of the planning tools mentioned by myself and others will assist you in the selection for spread in azimuths.


    On Jan 27, 2016 12:37 AM, "Steve E. Bryant" <NoReply_Bryant@fer3.com> wrote:



    So the difference in azimuth angle between two bodies is a direct measure of the intersection of the LOPs or vice versa; and, the altitudes of the bodies really do not affect the intersection of the LOPs?


    In Celestial Tools, under the tab “view,” and the tab “star finder,” there is a convenient “wheel” that can be spun around allowing an easy means of assessing the azimuth angles; apparently, that is all that truly impacts the LOP intersection given that all other aspects of taking sights and their subsequent reduction is flawless. 


    Any other basic insights to the use of the tool and or the practice of taking sights worthy of note will not be wasted here and will be greatly appreciated.


    Thank you all again for your comments,




    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Frank Reed
    Sent: Tuesday, January 26, 2016 7:57 PM
    To: steveebryant---.net
    Subject: [NavList] Re: Planning a fix with >45 degrees intersection inLOPs


    Brad Morris, you wrote:
    "However, the original question was how to do it with 'Celestial Tools' "

    No, that wasn't his question! Steve mentioned 'Celestial Tools', that's true, but what he asked was how azimuth difference was connected with the angle of intersection of the LOPs. Trouble is, that's so obvious that most people here read right through it and didn't get it.

    Frank Reed

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