Re: Alternative to the analemma hoax



oriel36 wrote:
The principles which reduce the observation of natural noon to 24 hour
noon in order to keep the 24 hours of Monday turning into the 24 hours
of Tuesday were explained in detail by Huygens -

"Draw a Meridian line upon a floor... and then hang two plummets,
each by a small thred or wire, directly over the said Meridian, at the
distance of some 2. feet or more one from the other, as the smalness
of the thred will admit. When the middle of the Sun (the Eye being
placed so, as to bring both the threds into one line) appears to be in
the same line exactly...you are then immediately to set the Watch, not
precisely to the hour of 12. but by so much less, as is the Aequation
of the day by the Table."

http://www.xs4all.nl/~adcs/Huygens/06/kort-E.html

At the Equator,there would be no variation whatsoever in the apparent
elevation of the Sun,at higher latitudes,variations occur and at polar
latitudes extreme variations occur.

http://www.youtube.com/watch?v=nwTrYVBcx9s

The specific and fascinating way a planet orbits the Sun by a slow
change in its orbital orientation to the central Sun can be
appreciated in that time lapse footage .It is a bit easier to see why
the natural noon cycles vary due to an orbital component by analogy
and by imagining that you are looking at a crankpin head on as it
'orbits' the central shaft -

http://www.youtube.com/watch?v=YV9WkQkUHZ4

The variations in the natural noon cycle whn allied with axial
rotation affirms the presence of the orbital component as the slow
turning motion is in accordance with Kepler's view of orbital motion
and geometry. and explains why there are no seasonal variations in
daylight/darkness at the Equator but North and South experiences
seasonal variations.

The analemma has no place in astronomy,never did.

It is not correct to say there are no seasonal variations in day/
night at
the equator. During our spring and fall, the days are longer at the
equator. It is not a lot but easily measured. This can be easily seen
by exaggerating the angle of the sun and using a spherical Earth.
As for analemma, as one move North or South from the equator,
there is a tilt ( I'd have to think which way ) of the analemma. This
is caused by the tilt of the Earths axis.
Since, observation of the Sun is part of astronomy, the statement
that is has no place is also not correct. You may not like this but
that is life. The real universe doesn't care what you like.
The vertical axis of the analemma is caused, mostly, by the tilt of
the Earth
axis. The spread or horizontal is, mostly, caused by the elliptical
orbit.
These two do interact a little since the Earth tilt doesn't line up
exactly with the major axis of the orbit.
Dwight
.

Relevant Pages

  • Re: Alternative to the analemma hoax
    ... When the middle of the Sun (the Eye being ... seasonal variations. ... by exaggerating the angle of the sun and using a spherical Earth. ... there is a tilt of the analemma. ...
    (sci.astro.amateur)
  • Re: Visiting the NOAA website
    ... day/night cycle through daily rotation never mind the orbital specific ... for seasonal variations therefore this is not a game and never has ... The surface of the Earth is cooler than the surface of the Sun. So the ...
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  • Re: Oriel36 - I am very disappointed!
    ... with the motions of the Earth ?.If you know that no daylight/darkness ... variations occur at the Equator and the seasonal variations split ... This is the direct result of the axial tilt of the Earth relative to ... its orbit around the sun. ...
    (sci.astro.amateur)