[geocentrism] Re: an aside.
- From: "philip madsen" <pma15027@xxxxxxxxxxxxxx>
- To: <geocentrism@xxxxxxxxxxxxx>
- Date: Thu, 21 Aug 2008 15:03:21 +1000
Marc said:
Philip,
The Sun doesn't take the same time to travel from noon to noon, the time
varies up to 30 seconds. Thats ok.. I can get that.
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. THIS I DO NOT GET. IT AINT OK.. maybe I just never could
visualise 3D geometry. or it being projected on to a 2D sundial.
But if the sun was getting to be 20 minutes late by my watch at mid day,
(adjusted for my longitude of course) I'd be very worried. That time is when
the shadow is shortest on the ground neath a vertical pole. At my longitude
thats 32 minutes before Standard time based on Melbourne.. So far it seems the
shadow is shortest right on cue through out the year. at 11.28am. and its
always pointing exactly due south.
Phil
----- 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 30
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.
Other related posts:
