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
    Minimum Altitude for Daytime Venus
    From: Greg Rudzinski
    Date: 2015 Nov 16, 14:55 -0800

    Some CN navigators may be having trouble picking up Venus during the day. Right now is a good time to be trying for a daytime Venus observation since elongation is near the maximum. A few pointers. Precalculate altitude and azimuth then use a hand bearing compass to orient the sextant.  Check scope focus. Rather than focusing on the horizon it is better to focus on a sunspot to get the needed infinite focus. If all is failing then break out the 7x50mm binoculars. If Venus can't be seen with these then there is no chance with the sextant scope.

    As an experiment I watched Venus with a U.S. Navy Mk 3 M. Low sextant w/4x40mm scope and a U.S. Navy Mk 3 Bendix bubble octant w/ x2 scope. Venus was visible with both down to 9° then abruptly faded away into the horizon haze.

    Greg Rudzinski

       
    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