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14,000 BCE
Hominids First Appear (14 Million Years Ago)
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Period: 10,000 BCE to 1 CE
HUNDREDS OF YEARS FROM HOMINIDS (14Million) TO YEAR 1
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276 BCE
Eratosthenes (276 BC- 194 BC)
Eratosthenes was an ancient Greek astronomer, geographer, and mathematician. He lived from 276 to 194 B.C. Eratosthenes is most famous for making the first accurate measurement of the circumference of the Earth. He lived and worked for most of his life in the city of Alexandria in Egypt. -
85
Claudius Ptolemy (85 CE-165 CE)
Introduced the Geocentric theory of the universe. -
1473
Nicolaus Copernicus (1473-1543)
Introduced the Heliocentric theory, made a big impact. -
1546
Tycho Brahe (1546-1601)
Danish astronomer Tycho Brahe made the most accurate celestial observations of his time and challenged the prevailing belief in how the universe was organized. Brahe showed irregularities in the Moon's orbit and discovered a new star in the Cassiopeia formation. -
1561
Francis Bacon (1561-1626)
His works are credited with developing the scientific method and remained influential through the scientific revolution. Bacon has been called the father of empiricism. -
1564
Galileo Galilei (1564-1642)
An Italian Renaissance man, Galileo used a telescope of his own invention to collect evidence that supported a Sun-centered model of the Solar System. -
1571
Johannes Kepler (1571-1630)
Johannes Kepler was a German astronomer, mathematician, and astrologer. He is a key figure in the 17th-century scientific revolution, best known for his laws of planetary motion. -
René Descartes (1596-1650)
Rationalist, philosopher, cartesian skepticism. His fundamental break with Scholastic philosophy was twofold. First, Descartes thought that the Scholastics' method was prone to doubt given their reliance on sensation as the source for all knowledge. -
John Locke (1632-1704)
Empiricist. He offered an empiricist theory according to which we acquire ideas through our experience of the world. The mind is then able to examine, compare, and combine these ideas in numerous different ways. Knowledge consists of a special kind of relationship between different ideas. -
Isaac Newton (1643-1727)
Sir Isaac Newton developed the three basic laws of motion and the theory of universal gravity, which together laid the foundation for our current understanding of physics and the Universe. -
Dmitri Mendeleev (1834-1907)
Created the periodic table of elements. Big impact on chemistry. -
Marie Curie (1867-1934)
Marie Curie discovered two new chemical elements – 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 the intrinsic brightness of a variable star and the time it took to vary in brightness, making it possible for others to estimate the distance of these faraway stars, conclude that additional galaxies exist, and begin mapping the Universe. -
Alfred Wegener (1880-1930)
Alfred Lothar Wegener was a German polar researcher, geophysicist, and meteorologist. In 1912 Alfred Wegener noticed the same thing and proposed that the continents were once compressed into a single protocontinent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. -
Edwin Hubble (1889-1953)
In the course of five years, Edwin Hubble twice changed our understanding of the Universe, helping to lay the foundations for the Big Bang theory. First he demonstrated that the Universe was much larger than previously thought, then he proved that the Universe is expanding. -
Harry Hess (1906-1969)
Harry Hess was a geologist and Navy submarine commander during World War II. Part of his mission had been to study the deepest parts of the ocean floor. In 1946 he had discovered that hundreds of flat-topped mountains, perhaps sunken islands, shape the Pacific floor. Hess proposes sea-floor spreading, plate tectonics.
