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
    Altitude and Azimuth in 3 minutes (by Prof. Akhmatov V.V., 1936)
    From: Tony Oz
    Date: 2019 Oct 21, 02:12 -0700

    Hello!

    Elsewhere I was introduced to a Russian publication (from 1936) named "The Altitude and Azimuth in 3 minutes" by Prof. Akhmatov V.V.

    Essentially it boils down to a set of tables helping to use the following formulas:

    • hav(z) = hav(φ - δ) + cos(φ) · cos(δ) · hav(t)
    • sin(Z) = cos(δ) · sec(90° - z) · sin(t)

    where:

    • z - the zenith distance
    • δ - declination
    • φ - latitude
    • t - local hour angle
    • Z - azimuth angle

    All the multiplications are handled by logarithms, the resulting azimuth comes out in the "quadrant" notation. The more convenient 0°...180° E/W azimuth angle range is also possible by a longer computation.

    Though the book's title is similar to some "This and Other for Dummies" is it said to be the processed compilation of the best available (to the date) foreign methods of sight reduction. I wonder who's works were the donors?

    I did try that set of tables - obviously it took longer than 3 minutes, may be because it needs some practice to master. The all-Haversine Doniol is significantly easier (to my liking).

    Warm regards,
    Tony
    60°N 30°E

       
    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