[geocentrism] Re: an aside.
- From: <marc-veilleux@xxxxxxxxxxxx>
- To: "Geocentric" <geocentrism@xxxxxxxxxxxxx>
- Date: Wed, 20 Aug 2008 22:53:23 -0400
Philip,
The Sun doesn't take the same time to travel from noon to noon, the time varies
up to 30 seconds.
Furthermore, since the Sun is not always at the same distance from the Earth
and is moving north-south relative to the observer, there is a variation of
around 20 minutes from noon to noon on the sundial.
Marc V.
----- Original Message -----
From: philip madsen
Sent: 20 août 2008 20:04
To: geocentrism@xxxxxxxxxxxxx
Subject: [geocentrism] Re: an aside.
There is a Guided Tour talk on the subject of 'time' in GU 3.0
Neville.
If Gu is as clear as that then I will be none the wiser.. I know the days are
shorter.. but as the sun takes the exact same time to go from NOON to NOON all
the year round, how can it get to be 10 mins late some times???
Phil.
----- Original Message -----
From: Neville Jones
To: geocentrism@xxxxxxxxxxxxx
Sent: Thursday, August 21, 2008 7:35 AM
Subject: [geocentrism] Re: an aside.
Philip,
The Sun's rising and setting, and the length of time that it is above the
horizon, varies from day to day. Since wristwatches cannot be made to reflect
these variations and since we divide periods into equal increments (60 sec = 1
min, 60 min = 1 hr, 24 hrs = 1 day), it is actually the mean, or average, taken
over 12 months, that is used for watch and clock calibration.
In other words, to be more precise, 24 mean solar hours = 1 mean solar day. We
thus invent a 'mean Sun' that is constant in its imaginary rotation, as well as
the 'true Sun' that follows a helical locus.
There is a Guided Tour talk on the subject of 'time' in GU 3.0
Neville.
-----Original Message-----
From: pma15027@xxxxxxxxxxxxxx
Sent: Wed, 20 Aug 2008 11:50:29 +1000
To: geocentrism@xxxxxxxxxxxxx
Subject: [geocentrism] an aside.
live and learn or are they wrong.
Sundial site sayeth: In respect to true solar time, mean time indicated by our
wristwatches has a periodic variation that during the course of a year can
exceed a quarter of an hour.
Now Apart from the shadow of a vertical pole lengthening and shortening with
the seasons, I would have expected the shortest shadow of the day, as being
noon, and that this would occur at the same time relative to the local time
every day of the year. How can he talk of a 15 minute variation?
My simple answer is that this is as regards the dial calibration method.
Why the trivia.. I am currently monitoring my solar panels and need to know
exact noon... and site interfered with my reasoning.
Phil.
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