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: Extracting the HP of the Moon from the Nautical Almanac daily pages
    From: Frank Reed
    Date: 2015 Feb 6, 14:44 -0800

    Stan, you wrote:
    "In 'real life' this is pretty unimportant, since the HP never varies by more than 0.1' from one hour to the next"

    Exactly! COMPLETELY unimportant. The choice is not tough: do you want to give students instructions that are more accurate by at most a tenth of a minute of arc (which translates to even less than that for average altitudes), or give them instructions that are less prone to error and do not introduce a pointless extra step. If you're actually writing "practical" instructions, the first choice, going for a trivial improvement in accuracy, would be foolish, wouldn't it? If you are working on the last line at the bottom of a page, would you really want navigators turning to the next page to get that HP from the next line??
    Use the easy one line data lookup.

    Frank Reed
    Conanicut Island USA

    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