Cosmic Calendar Girl
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Cosmic Calendar Girl
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From Wikipedia, the free encyclopedia
Method to visualize the chronology of the universe
Geologic Calendar
Big History – Academic discipline which examines history from the Big Bang to the present
Detailed logarithmic timeline – Timeline of the history of the universe, Earth, and mankind
List of timelines
Timeline of ancient history
Timeline of early modern history
Timeline of the evolutionary history of life – Major events during the development of life
Timeline of the far future – Scientific projections regarding the far future
Timeline of human evolution – Chronological outline of major events in the development of the human species
Timeline of human prehistory
Timelines of modern history
Timeline of natural history
Timeline of plant evolution – Chronological outline of major events in the development of plants
Chronology of the universe – History and future of the universe
Timeline of the Middle Ages – Timeline
Cosmic time
Wikibooks has a book on the topic of: High School Earth Science
Lynn Margulis (first wife)
Dorion Sagan (son)
Linda Salzman Sagan (second wife)
Nick Sagan (son)
Ann Druyan (third wife)
Sasha Sagan (daughter)
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 .
In this visualization, the Big Bang took place at the beginning of January 1 at midnight, and the current moment maps onto the end of December 31 just before midnight. [1]
At this scale, there are 437.5 years per cosmic second, 1.575 million years per cosmic hour, and 37.8 million years per cosmic day.
The concept was popularized by Carl Sagan in his 1977 book The Dragons of Eden and on his 1980 television series Cosmos . [2] Sagan goes on to extend the comparison in terms of surface area, explaining that if the Cosmic Calendar is scaled to the size of a football field, then "all of human history would occupy an area the size of [his] hand". [3]
Date in year calculated from formula
T(days) = 365 days * ( 1- T_Gya/13.797 )
Big Bang , as seen through cosmic background radiation , which would have been last emitted 14 minutes after midnight
First known remains of biotic life (discovered in 4.1 billion-year-old rocks in Western Australia ). [5] [6]
Arthropods (ancestors of insects, arachnids)
Permian–Triassic extinction event ; 57% of all biological families and 83% of all genera die
Ptolemaic astronomy, Roman Empire , Christ , invention of numeral 0 , Gupta Empire
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