Date and time of human arrival according to the one-year calendar model based on the Big Bang theory is December 31, 11:54 pm.
The Cosmic Calendar is a technique for visualizing the chronology of the universe, scaling its currently recognized age of 13.8 billion years to a single year to aid in its intuitive understanding for educational or popular science purposes.
According to the Big Bang theory, the cosmos first existed in a state of great density and warmth before expanding. It is the dominant cosmological theory that describes how the universe has changed over time, from the earliest known epochs to its later large-scale shape.
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