Abstract
The apparent age of the universe is about T » 13.56´109 years. Light is part of our everyday life, but it has not always existed. According to physicists, it began to exist about ~360 000 to 380 000 years after the Big Bang. 
 
 We calculated the exact moment of the appearance of light based on a new cosmological model shown in 2019. In this model, we make the following hypotheses: 1) The apparent radius of curvature of the universe increases at the velocity of light. 2) Our universe is in rotation on itself. 3) The tangential speed of the universe’s periphery is the same as an electron. 4) Our universe is made of a ″material universe″ imbricated in a ″luminous universe″. 
 
 With Einstein’s laws of relativity for spinning disks and the addition of speeds, we can establish the moment where the universe became transparent and emitted light. We evaluate that moment to ~361 108 years after the Big Bang.
 
 The assumptions used for the calculations reveal some interesting facts about the structure and characteristics of our universe. This article may be a step-stone for other analyses.
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