A note on the solvable model of cosmology in the Earth-related   coordinate system
  As a note for paper [physics/0505035], this is to make it more clear how we can depend upon Einstein's theory of gravitation and two assumptions of the cosmological principle and perfect fluid, in the so-called Z-approximation, to construct a solvable model of cosmology in the Earth-related coordinate system. Hence, the cosmic acceleration becomes understandable. 
Jian-Miin Liu