Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Stellarium Program as practice tool
    From: Frank Reed
    Date: 2019 Jun 7, 12:34 -0700

    You asked:
    "Should the Altitude, noted as "apparent" in the Stellarium data for each object agree precisely with my sextant reading (Hs)?"

    No. You can get close with a little effort. The displayed altitudes are, first of all, the altitude of the body center. Also, there is no "dip" and no provision for setting height of eye.

    Suppose you take the Sun altitude from Stellarium, and you want to compare it with a sextant observation. The altitudes in Stellarium include refraction and parallax, but they do not include dip or SD. For a quick fix for approximate comparison, subtract 12' from the displayed apparent altitude of the Sun in Stellarium. 

    You can also remove refraction from Stellarium altitudes by turning off the atmosphere. So for stars and planets, you can directly compare corrected sextant altitudes (Ho values) with the displayed altitudes in Stellarium with the atmosphere off.

    Frank Reed

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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