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
    "Sun Slow Day" is coming...
    From: Frank Reed
    Date: 2009 Feb 9, 00:11 -0800

    I'm starting a new holiday. It's called "Sun Slow Day". It's coming up in the next few days. 
    
    "Sun Slow Day" is the day during the year when the Sun is latest getting to 
    the meridian. It will reach the meridian about 14 minutes and 15 seconds 
    after local mean noon. In terms of the analemma, it's the spot that is at the 
    right edge of the larger lower lobe of that "figure-eight" shape. On a graph 
    of the Equation of Time, it's the deep minimum that occurs in northern 
    hemisphere winter. I propose that "Sun Slow Day" should be properly 
    celebrated by fourteen minutes and fifteen seconds of procrastination. 
    
    If you're trying to explain to explain to people lacking in astronomical 
    knowledge why they should care about "Sun Slow Day", you can tell them that 
    this is the day in the year when the maximum ultraviolet exposure occurs 
    latest in the afternoon (though of course days when the Sun is at higher 
    altitude inevitably have higher total exposure). So if you're looking for a 
    perfect tan in some part of the world where it's warm enough for that (that 
    just might be Chicago in a couple of days --we're having a heat wave to make 
    up for our Siberian January), then you should lay out for a time centered 
    around 12:14 local mean time. Time zone corrections are much more important, 
    but we can deal with that in the next lesson... :-)
    
    So now here's a serious question, which I think would be a good challenge for 
    the calculating folks of NavList. For the year 2009, what is the exact moment 
    when the Sun is slowest? That is, on what day and at what hour of GMT does 
    the Equation of Time reach its minimum value for the year? And how much does 
    this change from year to year? And an easier question, what is that minimum 
    value?
    
    -FER
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    

       
    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