Carl Denk wrote:
> 1: The gravitational constant is an assumed standard average value for
> use at earth's surface for standard results of calculations.

No.  You are confusing the universal gravitational constant (what the OP
asked about) with the accelleration due to gravity at earth's surface.  The
first is usually referred to as "G", the latter as "g".

The first (G) is the proportionality constant of the equation that describe=
s
how two masses attract each other.  It has nothing specifically to do with
the earth other than the earth is a mass described by the equation.

The second (g) is the effect of gravity felt at the surface of the earth.
This varies because the earth varies.  Although it does vary due to
altitude, the composition of the earth nearby underneath, these are
relatively small variations if you stick to the earth's surface.  9.8m/s**2
is correct at its implied accuracy.


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