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: Star CN with DSLR Camera
    From: Sean C
    Date: 2016 Jan 28, 23:51 -0800

    Bill and Greg,

    Out of curiosity, I tried using Adobe Photoshop to measure the pixels. It has movable horizontal and vertical guides that I placed on the upper, lower, right and left limbs. I then split the differences between those guides and put two new guides at the center of the square they formed (one vertical, one horizontal giving me a set of crosshairs at the center). Next, I used the convenient ruler tool to measure the pixels from the crosshairs to the horizon. The result after all that: 2,402.5 pixels (apparently PS can acheive sub-pixel accuracy!). Using Greg's corrections, I get an Ho of 22°18.0'; an intercept of 0.9' away. In other words: roughly the same result. ;)

    Cheers,

    Sean C.

       
    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