the Hubble constant is only isotropic if your are not moving? is it different depending on which direction you look due to our movement?No, rate of expansion of the universe varies by how fast the observer is moving. Example is the Cosmic Microwave Background which is blue shifted in the direction the Earth is moving relative to it and red shifted behind us. This is known as CMB Dipole Isotropy. Earth is moving 371 km/s in the direction of the constellation Leo.
The observed rate varies by how much?No, rate of expansion of the universe varies by how fast the observer is moving
The expansion rate of the Universe is the same everywhere. Our motion through the universe is additive to it thus the observed rate varies.
2)Gravity affects the relative motion between us and any observed body but is not connected to the Hubble constant.
Peculiar that mass is irrelevant in this acceleration equation.Yes, acceleration is the first derivative of velocity. Since velocity increases 70 km/s/Mpc, the number "70 kn/s/Mpc" is the acceleration.
In a gravitational field, the acceleration of a mass is independent of its mass. This is the classic Galileo experiment with two balls of different mass dropped off the Leaning Tower of Pisa.Peculiar that mass is irrelevant in this acceleration equation.
when Force = Mass x Acceleration seems that something is missing.