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
    Name or NavList Code:
    Email:
       
    Reply
    2016, June 14th Mars Lunars
    From: Sean C
    Date: 2016 Jun 14, 09:33 -0700

    Attached are the results of some lunars I shot late last night. I graphed the sextant distances and used two calculated distances to fit a slope to them (the dashed line). Using this method, I was able to pick out one of the better observations, although not one of the best. I worked that one (the fourth observation) using the formulae from Frank's "easy lunars" page. After that, I used his online clearing app to calculate the errors for all of the observations. I PhotoShopped the red line into the graph to represent the errors thus obtained.

    I suppose the difference in the slopes is due to the effects of refraction, parallax and semi-diameter augmentation. Perhaps a better fit could be obtained by either clearing all of the distances first, or working these effects back into the calculated distances. Thoughts, anyone?

    Regards,

    Sean C.



    File:



    File:



       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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