since you are a scientist could you please inform us what the new gravity constant is when grace is around.
It has never been an absolute constant nor is the speed of sound or many other science constants.
Gravity was standardized for one reason alone to make all weights uniform so you could trade goods and agree on the the same weight. The weight standard resides in SI in paris and there is actually a funny backstory that it has been losing weight (
http://www.msnbc.msn.com/id/20744160/ns/...y-loses-weight/)
It is defined as precisely 9.80665 m/s2, or about 35.30394 (km/h)/s (≈32.174 ft/s2 or ≈21.937 mph/s). This value was established by the 3rd CGPM (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration; the total (the apparent gravity) is about 0.5 percent greater at the poles than at the equator.
Although the symbol g is sometimes incorrectly used for standard gravity, g (without a suffix) strictly means the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see Earth's gravity).
That kilogram bar is set against standard gravity.
Now read what Earths gravity is (http://en.wikipedia.org/wiki/Earth%27s_gravity)
So the answer is it is you that has been confused and gravity on earth was never constant, standard gravity definition to define weight is a constant.
At secondary schooling level they probably interchangably use the standard gravity in calculations but standard gravity and earth gravity always have been different and known to be so as far back as the 118 year kilogram standard bar has existed.
You may now be interested to search what things affect the speed of sound because it is not constant either although probably taught as a constant at secondary school :-)
