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    Re: Latitude by Noon Sun for Beginners
    From: Frank Reed
    Date: 2009 May 2, 21:03 -0700

    JKP, you may also want to look up "analemma". Maybe visit analemma.com. The 
    "analemma" is a convenient and formerly very common way of graphing the Sun's 
    declination versus the "equation of time" during the year. It looks like a 
    narrow figure-eight and used to be commonly drawn on globes, usually in the 
    relatively empty part of the globe in the Eastern Pacific.
    Incidentally, "equation of time" is an odd, archaic phrase that sometimes 
    causes confusion. There's no "equation" here in the modern sense (except to 
    the extent that there is an equation for everything). The "equation of time" 
    is the difference between Local Mean Time and Local Apparent Time. It tells 
    us how late or early the Sun is to the meridian, at the central meridian of 
    any time zone. Equivalently, it's the difference between sundial time and 
    watch time, again at the central meridian of the time zone, and you will 
    frequently see a graph of the EqT affixed to sundials. No better alternative 
    expression to "equation of time" has ever caught on, so that's still how it's 
    known today.
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