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If the 13.8 billion-year history of the universe is compressed into one year, in which month did humans appear? May? September?
The cosmic almanac proposed by the famous popular science author and astronomer Carl Sagan in "The Dragon of Eden" will make you drop your jaw.
Let's take a look at the moment when the great events of the universe, the earth and mankind all appeared!
If you compress the history of 13.8 billion years into 1 year, it is obvious that time has accelerated. In this calendar, every second in the calendar is equivalent to 438 years, one hour on the calendar is equivalent to 1.58 million years, and one day on the calendar is equivalent to 37.8 million years.
In this cosmic calendar, a person lives to be 80 years old, and the universe has only passed 0.18 seconds.

January 1
Big Bang
May 1
The Milky Way was born
September 9
The solar system was born
September 14
The Earth was born
September 25 left and right
Earth produced the first life
October 2
The oldest known rock on Earth
October 9
The oldest fossils on Earth (bacteria and cyanobacteria)
November 1 left and right
Birth of sexual reproduction (microorganisms)
November 12
The oldest fossil of photosynthetic plants
November 15
Eukaryotes (the first cells with nuclear nuclei) began to flourish
December 14
Multicellular organisms are born
December 17
The Cambrian period broke out, and the Cambrian period of the Phanzoic Paleozoic began
December 18
Marine plankton emerged; the era of trilobites flourishing
December 19
The first fish; the first vertebrates
December 20
The first vascular plants
December 21
Marine animal landings
December 22
The first amphibians; the first winged insects
December 23
The first trees; the first reptiles
December 24
Dinosaurs appear
December 26
The first mammals
December 27
The first birds
December 28
The first flowers; the dinosaurs went extinct
December 29
The first primates
December 30
The frontal lobes of primates began to evolve more advanced; human species emerged
All of this happened on December 31st
1:30 p.m
Proconsul and ramapithecus, who may have been the common ancestor of modern apes and humans
10:30 pm
The first humans
11pm
Paleolithic
11:46 p.m
Peking people learn to use fire
11:56 p.m
The beginning of the recent ice age
11:58 p.m
Humans landed in Australia
11:59 p.m
The age of cave painting in Europe
11:59:20 p.m
Humans entered an agrarian society
11:59:35 pm
Neolithic beginnings;
Mankind had its first city
11:59:50 pm
The first dynasties appeared in Sumer (early Civilization of Mesopotamia), Ebra (ancient kingdom of West Asia), and Egypt;
Astronomy began to develop
11:59:51 p.m
The alphabet was invented;
The first empire in human history, the Akkadian Empire of Mesopotamia, was born
11:59:52 p.m
Promulgation of the Code of Hammurabi in Babylon;
The Middle Kingdom of Ancient Egypt
11:59:53 p.m
Bronze Age;
Ancient Greek Mycenaean civilization;
Trojan War;
Olmec civilization, one of the oldest American civilizations;
The compass was invented
11:59:54 p.m
Iron Age;
The First Assyrian Empire;
Kingdom of Israel;
The Phoenicians established the city of Carthage
11:59:55 p.m
The reign of Ashoka of India;
Qin Dynasty, China;
The Age of Pericles, the leader of the Golden Age of Athens;
Buddha's Birthday
11:59:56 p.m
Euclidean geometry;
Archimedes Physics;
Ptolemaic astronomy;
Birth of the Ancient Roman Empire;
Christ was born
11:59:57 p.m
The Indian aryabhata invented the zero and decimal;
The fall of ancient Rome;
Islam and Islamic civilization were born
11:59:58 p.m
Mayan civilization;
Chinese Song Dynasty;
Byzantine Empire;
Mongol Expedition to the West;
Crusades
11:59:59 p.m
European Renaissance;
The Great Voyage of Europe;
Zheng He of the Ming Dynasty of China went to the West;
Modern science is born
The First Industrial Revolution
We are in an era
Einstein's birthday;
Invention of the computer;
Landing on the moon;
The invention of the web
...
May 2 of the following year
The Sun becomes a red giant
May 7 of the following year
The Sun becomes a white dwarf
In the cosmic calendar, Confucius was born 5.8 seconds before midnight on December 31, and Newton was born before 0.76 midnight; at 0.02 seconds before midnight (calculated by the time Sagan wrote the book), we just had the Internet; and by May 7 next year, the sun will enter the old age of life and become a white dwarf. Where will humanity go then?
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Resources:
http://visav.phys.uvic.ca/~babul/astrocourses/p303/bb-slide.htm