Smith From the wiki article you pointed to: Cosmic time t is a measure of time by a physical clock with zero peculiar velocity in the absence of matter over-/under-densities (to prevent time dilation due to relativistic effects or confusions caused by expansion of the universe)..
The time scale of the universe refers to the relative size of the universe and all events occurring within it.
Best estimates show that the universe has been around for 13.8 billion years.
It started with the Big Bang, and expanded rapidly..
The Cosmic Year
At this scale, there are 434 years per second, 1.57 million years per hour, and 37.7 million years per day..
The present-day universe is understood quite well, but beyond about 100 billion years of cosmic time (about 86 billion years in the future), uncertainties in current knowledge mean that we are less sure which path the universe will take..
The Cosmic Calendar is a scale in which the 13.7 billion year lifetime of the universe is mapped onto a single year.
This image helps to put cosmology, evolution, and written history in context.
At this scale the Big Bang took place on January 1 at midnight, and the current time is mapped to December 31 at midnight..
The time scale of the universe refers to the relative size of the universe and all events occurring within it.
Best estimates show that the universe has been around for 13.8 billion years..
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science .
