Does the moon's shadow change relative to the sun

No. For example, one rotation of the Earth takes 24 hours, one revolution around the sun takes 365.25 days, etc. This makes it very easy to create a standard system because no matter where you are in the world, this information stays the same.

Explanation:

The molar volume of an ideal gas is given by the formula Z =PV/nRT, since we are asked about the temperature and Pressure sincere P is the pressure and T is the temperature and when both are low the overall Z for the ideal gas will become low let it be Z’ and suppose volume of real gas is given by Z1.  

Then if previously the ratio was Z/Z1  under low temperature and pressure the new ratio would be Z'/Z1 and this ratio would be smaller than the previous ratio.