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140,000 BCE
HOMINIDS FIRST APPEAR (14 MILLION YEARS AGO)
First Hominids appeared on Earth . -
Period: 140,000 BCE to 1 CE
14 MILLION YEARS
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276 BCE
Eratosthenes ( 276 BCE- 194 BCE)
Eratosthenes was a Greek scientist who lived from 276 to 194 B.C. He studied astronomy, geography, and math. Eratosthenes is famous for making the first good measurement of the size of the Earth. He also measured the distance between Syene and Alexandria. With this information, he was able to calculate the circumference of the Earth. He also invented a mechanical device that astronomers used for many years to figure out where the stars were in the sky how they appeared to move. -
85
Claudius Ptolemy (85 CE-165 CE)
Invented the Geocentric Theory -
1462
Nicolaus Copernicus (1473-1543)
Introduced the Heliocentric Theory -
1543
Galileo Galilei (1564-1642)
He used a telescope of his own invention to collect evidence that supported the Heliocentric Theory. -
1546
Tycho Brahe (1546-1601)
Danish astronomer whose work in developing astronomical instruments and in measuring and fixing the positions of stars paved the way for future discoveries. His observations made it possible before the invention of the telescope which included a comprehensive study of the solar system. He induced Italian and Dutch artists and architects to design and decorate his observatory, and he invented a pressure system to provide the then uncommon convenience of sanitary lavatory facilities. -
1561
Francis Bacon (1561-1926)
Bacon believed the purpose of the scientific method was to not rely on past knowledge of ancient authorities, but to rely on observations that would be crucial to the evolution of science in the modern world. He published his ideas, in his book, 'Novum Organum'. -
1571
Johannes Kepler (1571-1630).
A German mathematician who used detailed data to prove that planets rotated in an elliptical path around the sun. -
Rene Descartes (1596-1650)
René Descartes invented analytical geometry and introduced skepticism as an essential part of the scientific method. He made an important connection between geometry and algebra, which allowed for the solving of geometrical problems by way of algebraic equations. -
John Locke (1632-1704)
He was known as a philosopher and was called "Father of Liberalism". He believed that we are born knowing nothing and all of our knowledge comes from our experience and senses. -
Isaac Newton (1643-1727)
Developed three basic laws of motion and gravity. -
Dmitri Mendeleev (1834-1907)
Created the periodic table if elements. This creation was a huge impact on chemistry. -
Marie Curie (1867-1934)
Marie Curie discovered two new chemical elements which are known as radium and polonium. She carried out the first research into the treatment of tumors with radiation. -
Henrietta Leavitt (1868-1921)
Henrietta Leavitt discovered the relationship between intrinsic brightness of variable star and the time it took to vary in brightness, making it possible for others to estimate the distance of these faraway stars. Therefore additional galaxies exist and begin mapping the Universe. -
Alfred Wegener 1880-1930)
Alfred Wegener proposed the theory of continental drift – the idea that Earth’s continents move. Despite publishing a large body of compelling fossil and rock evidence for his theory between 1912 and 1929, it was rejected by most other scientists. Wegener learned that fossils of the same species were present in Brazil and western Africa. -
Edwin Hubble (1889-1953)
In the course of five years, Edwin Hubble changed our understanding of the Universe twice. Helping by laying out the foundation for the Big Bang. He first demonstrated that the Universe was much larger than previously thought, then he proved that the Universe is expanding. -
Harry Hammond Hess (1906-1969)
Hess described how hot magma would rise from under the crust at the Great Global Rift. When the magma cooled, it would expand and push the tectonic plates apart. Evidence that he provided was how the sea floors were not smooth but were built more similar to canyon and volcano sea mountains.
