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
    Re: LED Street Lights
    From: David Pike
    Date: 2017 Aug 26, 02:56 -0700

    Will my wife be wasting her money if she buys me an A12?

    David.  LED street lights are pretty bright, witness driving towards cars with such lights.  We’ve got a particularly bright one on the main road west of us.  We’ve a sodium one outside our house, and I think I find the orangeness more annoying.

    Light pollution plus a dirty old light path is a problem with any aircraft sextant used on the ground.  I can’t see the A12 being any worse than any other aircraft sextant.  In fact, it might be better than most, because it had such a direct light path being reflected only once off , or observed through, glass and that’s it.  http://fer3.com/arc/imgx/A-12-sextant-manual-part-1.pdf I have to admit that I’ve never tried my A12 at night, but I’ll have a try first clear night we get.  It won’t matter that I’ve yet to find a bubble, because you’re only want to know if you can see the stars.  I can just about see bright stars through my MkIXs, but observing Polaris requires a lot of imagination.

    Mitigating techniques might be: observe only the brightest stars; persuade your Council that they can save money by turning off the street lights after midnight; operating from the shade of a suitable building; take your A12 somewhere where there’s less light pollution.  The A12 plus its case would be particularly good in this last respect, because it’s probably the smallest, lightest, least knee bruising aircraft sextant available.  You could carry it in your car plus a celestial app like ‘Navigator’ on your smart phone or net-book, and operate whenever an opportunity presented itself. DaveP

       
    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