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Considering ‘black hole geometry’ as the ‘eternal cosmic geometry’ and by assuming ‘constant light speed rotation’ throughout the cosmic evolution, at any time the currently believed cosmic ‘critical density’ can be shown to be the cosmic black hole’s eternal ‘volume density’. Thinking in this way and based on the Mach’s principle, ‘distance cosmic back ground’ can be quantified in terms of ‘Hubble volume’ and ‘Hubble mass’. To proceed further the observed cosmic redshift can be reinterpreted as an index of ‘cosmological’ light emission mechanism. By considering the characteristic mass unit as the initial mass of the baby cosmic black hole, initial physical and thermal parameters of the cosmic black hole can be defined and current physical and thermal parameters of the cosmic black hole can be fitted and understood. It can be argued that, there exists one variable physical quantity in the presently believed atomic and nuclear physical constants and “rate of change” in its magnitude can be considered as a ‘standard or true measure’ of the present ‘cosmic rate of expansion’. In view of the confirmed zero rate of change in inverse of the Fine structure ratio (from the ground based laboratory experimental results) and zero rate of change in the current CMBR temperature (from satellite data) it can be suggested that, current cosmic expansion is almost all saturated and at present there is no significant cosmic expansion and there is no significant cosmic acceleration. Note that in Big bang model, confirmation of all the observations directly depend on the large scale galactic distances that are beyond human reach and raise ambiguity in all respects. The subject of modern black hole physics is absolutely theoretical. Advantage of Black hole cosmology lies in confirming its validity through the ground based atomic and nuclear experimental results! Finally it is possible to show that, quantum mechanics is a branch of ‘Black hole cosmology’. Uncertainty relation and all other microscopic physical constants play a crucial role in understanding the halt of the present cosmic expansion.