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: Latitude by two stars observed simultaneously
    From: David Pike
    Date: 2017 Dec 22, 00:17 -0800

    I’m afraid I know where this is, because I stumbled upon the original snap while looking for Milky Way illustrations on the net.  All I have to do now is prove it from the information given.

    My first problem is that I’m pretty sure which constellation we’re looking at, but I can’t positively identify all the stars from pictures on the web.  When I try to download ‘Stellarium’, my best laptop gives me all sorts of dire warnings and recommends not doing so.  Therefore, should I download it anyway, or should I download it onto the less important net-book I use when travelling?  Also, should I download the 64bit or 32bit version? 
    I’m running a version of Windows 7, and I'm a digital dinosaur.

    My second problem is that I’m sure I’ve seen a method of finding latitude from two simultaneous altitudes and no timing information somewhere, but I’ve looked at all my books and I can’t find it. The net wasn’t much help either.  The thing is, am I looking for a simple 2D solution like Mer-Pass, or am I supposed to get into spherical geometry equating two or more spherical triangle with known sides, namely co-alt and co-dec, and a known angle between, namely diff in SHA, to find a common unknown side, co-lat?  More hints please. DaveP

       
    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