Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
    An azimuth nomogram: what's under the hood?
    From: Tony Oz
    Date: 2018 Mar 12, 11:27 -0700

    Hello!

    There is a nomogram to look-up an azimuth of a rising/setting celestial object. One enters it with observer's latitude (φ) and object's declination (δ) values, draws a line through these points - the third point is meant to show the azimuth according to the same name vs contrary name of (φ) and (δ). (If same name - on the inner scale, if contrary name - on the outer scale of the right wing of the parabola).

    I wonder which formulas would let me to calculate the scales? Why a parabola was selected for the nomogram?

    (I know that the parabola is one of the conical sections.)

    Please comment.

    Thank you in advance.

    Regards,

    Tony

    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