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Logically, it is impossible to understand all phenomena od nature we observe – especially the „long term processes“ in the universe, correctly. One could also argue differently: The path to a better understanding of the time term must necessarily lead via the cosmology, as only this opens sufficiently large space-time dimensions to us to perform, at all, those measurements necessary for the definition of a „cosmic time term“. On one hand, the modern measuring devices offered by the satellite-supported sensor technology should be sufficient for this task, but on the other hand, we need a theoretical model giving us the  information pertaining on what we should observe.
Or, as Einstein formulated drastically [3], p. 96/97: "Only the theory decides on what one can observe".
In [4], a suitable theoretical model for this is presented and confronted to the latest cognitions of cosmology and elementary particles physics. In this, it shows, the path leading us to a more comprehensive understanding of the time can only be found via the General Theory of Relativity (GTR).

2. An alternative world model- presentation of the results

The following deliberations are based upon axioms which today are accepted by the majority in science:
- Axiom 1: The speed of light is a universal natural constant
- Axiom 2: The laws of the GTR apply to the total universe
- Axiom 3: The universe spans out a plane (Euclidean) space, in the average over large distances
- Axiom 4: The universe expands at the speed of light
Let me presume here, the „cosmic time“ is the result of solving the paradoxon arising from axioms 1 and 4, in context with the GTR. [4].
From the field equations of the GTR, Einstein had, for a plane expanding universe,( Einstein- de Sitter- universe) ( Fig. 1), deduced the relation [5]. p. 107 ff
                   (1)
( = coupling constant in the field equations of the GTR, r = average mass density of the universe,
h = H/c = 1/t H c = 1/R = Hubble expansion )
 
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