Re: AU other than Astronomical Units?
- From: oriel36 <kelleher.gerald@xxxxxxxxx>
- Date: Mon, 28 Apr 2008 03:05:28 -0700 (PDT)
On Apr 27, 11:30 pm, Dr J R Stockton <j...@xxxxxxxxxxxxxxxxxx> wrote:
In uk.sci.astronomy message <4814c5f7$0$11638$607ed...@xxxxxx>, Sun, 27
Apr 2008 14:28:21, Robert <guyinc...@xxxxxxxxxxxxxxx> posted:
Can AU mean something other than Astronomical Units?
Angstrom Units. Australia. Aberdeen University. ...
Given this formula:
(m1 + m2)T^2 = a^3
T=years
m=solar masses
a is in units of AU
Can anyone guess what this equation means?
Ask Kepler. There, m should be M. Start with the obvious GMm/r^2 =
mrw^2 ; extract m ; put T = 2pi/w ; and eliminate G by knowing that a
circular orbit about the Sun at 1 AU takes a year. Now re-do it for M
not >> m, and orbits around the barycentre.
Is there another meaning of AU
related to acceleration?
If followed by DI, there's said to be plenty available.
--
(c) John Stockton, nr London, UK. ?...@xxxxxxxxxxxxxxxxxx Turnpike v6.05 MIME.
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.
When you are a naturally talented astronomer,you get to enjoy how
Newton unethically tranfered mean motion along planetary orbits to
mean Sun/Earth distances -
"PHÆNOMENON IV.
"That the fixed stars being at rest, the periodic times of the five
primary planets, and (whether of the sun about the earth, or) of the
earth about the sun, are in the sesquiplicate proportion of their mean
distances from the sun. " Newton
What Kepler actually wrote,based on orbital comparisons -
"The proportion existing between the periodic times of any two planets
is exactly the sesquiplicate proportion of the mean distances of the
orbits, or as generally given,the squares of the periodic times are
proportional to the cubes of the mean distances." Kepler
The sidereal framework or rather the solar/sidereal fiction is based
on mean Sun/Earth distances insofar as there is no indication of
Kepler's orbital geometry nor variations in orbital speed in that
framework and that is where it dovetails with Newton's ridiculous
invokation of celestial sphere geometry into heliocentric reasoning
as shown above -
http://upload.wikimedia.org/wikipedia/commons/1/1d/Tiempo_sid%C3%A9reo.en.png
You are wasting each other's time and all the sloppy non geometric
equations in the world cannot disguise that that it all amounts to
formalised astrology.
I will make it easy for you,a programming mind generally cannot
comprehend the language of astronomy,it is actually painful for you
and your mates to consider that the genuine framework,insights and
methods of astronomers exists outside the calendrically driven
clockwork solar system created in the late 17th century.While I do
sympathise that you do not have a feel for the intutive correction
system which keeps insights on track,the damage which the 'scientific
method' approach to astronomy is just too unstable and ridiculous at
the moment to do anything other than condemn it.
.
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