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
    or...
       
    Reply
    Re: Latitude and longitude around noon
    From: Peter Hakel
    Date: 2017 Mar 2, 15:21 -0800

    Frank,

    From the "transit" spreadsheet I compute your location as:
    N 41° 27.4’
    W 71° 26.7’

    From the "noon_motion" spreadsheet I compute your location as:
    N 41° 27.0’
    W 71° 27.1’

    Screenshots are attached; the Google maps location is for the “transit” coordinates (not quite on the beach, but note the distance scale in the lower right corner). The two spreadsheets differ as follows:

    *) “noon_motion” (being specific to the Sun) calculates the UT of the culmination and shifts the resulting longitude according to the equation-of-time value; also the hourly declination change is calculated only approximately from the month and day,

    *) “transit” (applicable to any celestial body), picks up the longitude from the user-entered GHA for the UT of the culmination; the hourly declination change is “exact” as input by the user.

    The parabolic fit computed internally by both spreadsheets works with observed altitudes that are prorated by the declination change and vessel motion to the moment of the last observation.



    Peter Hakel



    File:



    File:



    File:



       
    Reply
    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