ASTRONOMY IN TIME

THE BEGINNING

3200 BCE TO 500 BCE

• 3200 New Grange (Prehistoric Monument)
• 3100 Stonehenge (Prehistoric Monument)
• 620 Thales of Miletus (philosopher)
• 570 Pythagoras (Ionian Greek philosopher)

PROOF

500 BCE TO 325 BCE

• 430 Plato (Classical Greek philosopher)
• 395 Eudoxus of Cnidus (introduced astronomical globe)
• 385 Aristotle (thought of revolution)
• 385 Philolaus (Greek philosopher)

GROWTH

325 BCE TO 250 BCE

• 310 Aristarchus (Greek astronomer)
• 275 Eratosthenes (calculated circumference of earth)
• 250 Heliocentric Universe (earth at center)
• 250 Apollonius of Perga (Epicycle Model)

REVOLUTION

250 BCE TO 150 CE

• 190 Hipparchus (founder of trigonometry)
• 100 ce Claudius Ptolemaeus/ Ptolemy (astronomer and author)
• 150 ce Inferior Planet (Mercury and Venus)
• 150 ce Superior Planet (earth, through Neptune)
• 150 ce Retrograde Motion (apparent loop of planets)

DISCOVERY

1200 CE TO 1600 CE

• 1250 The Alfonsine Tables (kept track of the sun)
• 1300 Occam's Razor (two explanations, one is better)
• 1500 Copernicus (Renaissance mathematician)
• 1500 Copernican Revolution (new idea of sun revolution)
• 1500 Solar System (Copernicus idea)
• 1550 Tycho Brahe (know for accurate observations)

NEW SCIENCE

1600 CE TO 1700 CE

• 1600 Johannes Kepler (German mathematician)
• 1600 Kepler's Laws (planets revolve around the sun in ellipse patterns)
• 1600 Ellipse (path of travel for planets)
• 1600 Focus (the sun in his model)
• 1600 Galileo Galilei (found Jupiter)
• 1639 Transit (Jerimiah Horrocks, Venus)
• 1675 Sir Issac Newton (first reflecting telescope)
• 1675 Newton's Law of Universal Gravitation (affects whole universe)
• 1675 Newton's Laws of Motion (laws affect all of universe)

MODERN PROGRESS

1700 CE TO PRESENT

• 1765 Temple of Isis (Roman temple to Egyptian goddess Isis)
• 1775 Bode's Rule (every planet is 2x as far as the one before it from the sun)
• 1775 Titus (collaborate on Bode's Rule)
• 1775 Johann Bode (creator of Bode's Rule)
• 1820 Marie Mitchell (American astronomer)
• 1875 Henrietta Swan Leavitt (found relation between time and star brightness)
• 1880 Albert Einstein (E=mc^2)
• 1890 Edwin Hubble (proved that the universe is expanding)