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: Distant Horizon
    From: Herman Dekker
    Date: 2023 May 18, 00:27 -0700

    Hello Frank,

    The sentece: Let's call your altitude 4500 feet. At that height the mean density of the air is lower by about 15%. Interests me.
    Is there a table or formula to calculate the "reduction factor" for different heights above sea level.
    I am interested because when I am in Germany I take sights between 450 and 800 mtr. (1475-2620 feet) above sealevel.

    Or gives the local air pressure on that height already a sufficient correction?

    Regards<
    HermanD

       
    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