Say you pick a point on the Earth. The earth spins at some constant $x (I don't know how fast, sorry). Now, that point has a different relative speed to a fixed point on Earth's orbit as it revolves around the Sun. This point also has a relative speed to the galaxy from a fixed observer, and etc down to an arbitrary point in the Universe.
How would you calculate the absolute/actual speed of this point from a theoretical relative point in the Universe traveling at constant speed 0.
Would this be considered the absolute speed on the universe that all objects should be compared against?
(I'm not a physics person really, just got into an interesting conversation with a buddy at work)