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: Understanding a 1902 Sumner
    From: Frank Reed
    Date: 2017 Jan 20, 20:44 -0800

    And while we're at it, you can also get almanac data from my web app. Go here and select Online Nautical Almanac. You should find fairly exact matches with the USNO version. Finally, don't forget that you can use a source like Stellarium to simulate the sky from any location and in any era (outside the historical era there are some issues, but clearly for navigation problems, no worries). There used to be inaccuracies in the refraction model in Stellarium, oddly enough at intermediate altitudes, but I believe those are now resolved. I recommend checking a couple of test cases whenever using Stellarium since in a group project like this, entropy is a problem.

    Frank Reed

       
    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