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From: valls on 19 May 2010 11:17
Centre of mass inertial frames (CM) are without any doubt very useful
ones. Only referring the Solar System (SS) and the GPS (ECI) ones is
more than sufficient to support that assertion. Both SS and ECI are
real CM, meaning that their respective associated body sets are
composed by real bodies of our Universe. Now we want to make 3 very
simple questions:

Q1. Can we describe the movement of any real body in a specific real
CM?
Q2. Can we describe the Sun’s movement in the ECI?
Q3. Can we describe the Earth’s movement in the SS?

My own answers are the following:

A1. No, the unique bodies whose movements you can describe in a
specific CM are the ones belonging to the associated body set (the
ones taken into account when determining the centre of mass).
A2. No, because the Sun doesn’t belong to the ECI associated body set.
A3. Yes, because the Earth belongs to the SS associated body set.

RVHG (Rafael Valls Hidalgo-Gato)
From: Androcles on 19 May 2010 11:34

<valls(a)icmf.inf.cu> wrote in message
news:47547419-21ae-43e7-8955-26aea49e6c66(a)q8g2000vbm.googlegroups.com...
Centre of mass inertial frames (CM) are without any doubt very useful
ones.
================================================
"You are totally wrong saying that [the centre of mass]x, y and z
are INFEPENDENT OF TIME, because the coordinate x is
DEPENDENT of the time t." -- Rafael Valls Hidalgo-Gato

usted duende loco comunista ignorante del idiota.



From: BURT on 19 May 2010 14:00
On May 19, 8:34 am, "Androcles" <Headmas...(a)Hogwarts.physics_z> wrote:
> <va...(a)icmf.inf.cu> wrote in message
>
> news:47547419-21ae-43e7-8955-26aea49e6c66(a)q8g2000vbm.googlegroups.com...
> Centre of mass inertial frames (CM) are without any doubt very useful
> ones.
> ================================================
> "You are totally wrong saying that [the centre of mass]x, y and z
> are INFEPENDENT OF TIME, because the coordinate x is
> DEPENDENT of the time t." -- Rafael Valls Hidalgo-Gato
>
> usted duende loco comunista ignorante del idiota.

Gravity gives a geometric center to space.

Mitch Raemsch

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