You just completely ignored the previous poster's response...it
was completely correct that specific gravity is a measure of
DENSITY and density is NOT affected by gravity.

Density is defined a mass/volume

Weight is mass*gravity (f=ma, anyone?)

In your example the apparent gravity, g_a,
is equal to the gravity due to the earth, g_e,
minus the moon gravity due to the moon, g_m

g_a = g_e - g_m

The weight of the wine is g_a * mass(wine),
so yes, the weight of the wine changes (so
does the weight of the hydrometer). But buoyancy
does not depend on weight...the volume of both the
wine and the hydrometer AND the mass of both the
wine and hydrometer remain constant.

Thus no effect...end of physics lesson today.

IFbrewer







(OzWineKitz) wrote in message . com>...
> Just for the record, the oceans of the world cover approx 75%, the ice
> at the poles cover approx 3%, and the land masses cover the other 21%.
> The moon pulls on ALL things realiveto their weight in accordance with
> basic physice which determines that the Force is proportional to the
> weight and the distance squared. This is why the moon also contributes
> to tectonic plate movement and earthquakes, because even the earth is
> being pulled by the moon. But the weight of a Hydrometer is far less
> than the weight of of the wine we are measuring. Therefore the
> difference is exaggerated some 100+ times, isn't it?
>
> The question remains,what is the difference? What difference does
> atmospheric pressure impart to ones readings? Does alcohol behave
> differently at lower SG than say wine? Does anyone know the actual
> difference and percentages?
>
> Thanks for your imput anyway.
>
> Cheers,
> Steve!