Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Planning a fix with >45 degrees intersection in LOPs
    From: Bruce J. Pennino
    Date: 2016 Jan 25, 17:51 -0500
    Hello Steve:
     
    The USNO web site is the first place to get calculated data.But there is an easier method once you realize that any  altitude greater than 10 degrees works just fine, even 5-7 degrees. The easier method is to observe over the course of a couple of days the easiest celestial bodies to observe. For example, the moon and the sun  are often easily used. Venus and the moon work very well. Sometimes Venus and the sun if you after very good eyes or you precompute.
     
    Good luck

    Bruce














     
    Sent: Monday, January 25, 2016 4:52 PM
    Subject: [NavList] Planning a fix with >45 degrees intersection in LOPs
     

    Dear Navlisters,

    I want to plan my two body fix such that the resultant intersection of the two lines of position will not be less than 45°.

    I want to us the Celestial Tools software to help with the planning (unless there is a better way).

    I suspect that the individual Zn for each of the bodies to be used in the fix will be useful in chosing the ideal pairs.  I'm not sure how much their various altitudes will impact the selection such that I can be assured that the intersetion of the lines of positoin will not be less than 45°.

    Which of all the relationships among the celestial positions will be the easiest to review and compare in order to project what the likely angle of intersection will be?

    This question may be too general but I'm hoping there will be some simple rule of thumb.  I see that there is a fucntion which will permit some comparison between the relative angular positions among the stars/planets upon the celestial sphere but I'm not certain how that corralates to their respective lines of positions once the two sights have been taken.

    Steve Bryant

    View and reply to this message

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site