Hello Andrew,
Indeed, the EoT is the integrated difference between the solar day
length (apparent time) and mean solar day length ("mechanical time"),
which varies on the order of secs and has a maximum of 30secs. in
December. I just sent (in my last message) a URL of an image that
illustrates exactly this point.
ftp://ftp.gcstudio.com/pub/sundial/sday_eot.gif
Best,
Luke Coletti
Andrew Pettit wrote:
>
> But Tony, surely the "out of step" amount is just the accumulation of a few
> seconds each day. The "mechanical time" and even the "sidereal time" elapsed
> between noon and noon on consecutive solar days really is longer by a few
> seconds than it is on others. It is the liptical orbit and the inclination
> of the orbital plane to the axis of rotation that lead to the need for a
> correction.
>
> At 23:37 08/11/1999 +0000, Tony Moss wrote:
> >>----- Original Message -----
> >>From: John Carmichael <[EMAIL PROTECTED]>
> >>To: <[email protected]>
> >>Sent: Saturday, November 06, 1999 8:42 AM
> >>Subject: SEND QUESTIONS!
> >>
> >>
> >>> Attention Dialists!
> >>>
> >>> I'm feeling very frustrated. NASS put me in charge of accumulating from
> >>you
> >>> all frequently asked sundial questions. This is a very important project
> >>> since it will eventually be of great help to all beginning dialists, and
> >>> even to some of you old timers.
> >
> >".....so days get longer by sixteen minutes in December! Won't that mean
> that an extra day will be added every 90 days or so if every day is 16
> minutes longer?"
> >
> >Answer: Days don't get LONGER by 16 minutes. Solar Noon is 'out of step'
> with Clock Noon by 16 minutes in October?November
> >
> >It took a while for this light to dawn for me
> >
> >Tony Moss
> >
> ------------------------------Andrew Pettit--------------------------------
>
> e-mail: [EMAIL PROTECTED]
>
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>
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