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: Venus Moon Occultation Lunar Captured by DSLR
    From: Antoine Couëtte
    Date: 2015 Dec 9, 11:45 -0800

    Dear Frank,

    Your reply is quite interesting to me. Thank you for it.

    It turns out that a few years ago (maybe 4 or 5 years ago) I checked your On Line Calculator for Occultations of Stars. Some results were in error by up to 0.25' (15") when compared to other reportedly accurate software (e.g. http://www.lunar-occultations.com/iota/iotandx.htm or others) dealing with a spherical Moon shape (no consideration for mountains and valleys which start playing at the 0.1' level).

    This result did not surprise me since there are quite appreciable non linear effects when dealing with Occultations, hence the earlier mentioned and well known "5° to 7° minimum distance" caveats applicable to [almost] all [tabular] classical Lunar clearing methods.

    When Greg published your On Line Calculator results processed from his own Venus immersion/emersion data, I noticed that the error of his observations were rated by your Computer as being not more that 0.1 '. I then hastily concluded that your had fine tuned your software in between.

    Best Regards


    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