Important events in astronomical history


SOCRATES: Shall we make astronomy the next study? What do you say?
GLAUCON: Certainly. A working knowledge of the seasons, months and years is beneficial to everyone, to commanders as well as to farmers and sailors.
SOCRATES: YOU make me smile, Glaucon. You are so afraid that the public will accuse you of recommending unprofitable studies.  PLATO, Republic VII

Important events in astronomical history

B. C.
Before 4500
 Spring equinox in Gemini.  
 Solstices and equinoxes determined.  
 Sphinx originated.  

4500-3000
 Spring equinox in Taurus.  
 First maps made.  

3000-2500
 Pyramids built.  
 Majority of constellations named by sideronomists.  

2500-1800
 Emperor Yao founded Chinese calendar and punished astronomers who were drunk during eclipse.  

1800-1400
 Spring equinox in Aries.  
 Destruction of Cretan civilization.  
 Great Sun temple at Karnak finished.  
 Sundials and water clocks constructed.  

1400-800
 Iknaton started monotheistic Sun worship, 1375.  
 Babylonian Boundary stones erected.  
 Phoenician explorations.  
 Exodus of the Israelites from Egypt.  
 Fall of Troy.  
 Zoroastrian religion founded.  
 Solomon's temple built.  

800-600
 Babylonians predicted eclipses by Saros; their astrology became personal.  
 First Olympiad, 776.  
 Rome founded, 753, (but not built in a day).  

600-500
 Thales eclipse, 585.  
 Pythagoras identified morning and evening star, and began scientific study of planetary motions.  

500-400
 Persian wars and age of Pericles.  
 Herodotus recited his history in Athens, 438.  
 Anaxagoras discovered that the Moon shone by reflected light, 435.  
 Plato born, 427.  
 Peloponnesian war.  

400-300
 Death of Socrates, 399.  
 Discovery of Earth as a planet.  
 Plato taught true direction of planetary motions.  
 Aristotle taught geocentric theory.  
 Pytheas of Marseilles visited Britain.  
 Philip of Macedon conquered Greece, 346.  
 Alexander the Great measured the route to India, and died there, 323.  

300-200
 Aristarchus of Samos suggested heliocentric theory, 260.  
 Aratus compiled poetic list of constellations, 240.  
 Eratosthenes introduced armillary sphere; measured obliquity of the ecliptic; wrote geography.  

200-100,
 Hipparchus measured comparative distances of Sun and Moon; established astronomy and geography on geometric basis; discovered precession of the equinoxes; introduced astrolabes.  
 Spring equinox left constellation of Aries and entered Pisces, 140; Zodiacal signs differentiated from constellations.  

100-1
 Last year of Confusion, 46.  
 Julian calendar introduced, 45.  
 Strabo's geography published, 20.  
 Greatest conjunction of planets, 7.  
 Birth of Jesus Christ, 7.  

A. D.
1-200
 Jesus was crucified, 33.  
 Ptolemy wrote on astronomy, geography and mathematics, 150.  

200-400
 Heretics and astronomers driven eastward.  
 Spherical Earth denounced as heretical, 320.  
 Modern Hindu chronology started.  

400-600
 Rome conquered by Visigoths, 410.  
 Very dark ages.  
 Dionysius Exiguus devised modern chronology from birth of Jesus Christ.  

600-1000
 Flight of Mohammed from Mecca, 622.  
 Charlemagne crowned Emperor of the West, 800.  
 Alfred the Great founded Oxford University, 869.  
 Arabian astronomy flourished.  
 First Norse explorations.  

1000-1200
 Halley's comet and William the Conqueror; first Indian pueblo date, 1066.  
 Introduction of Arabic learning into Europe, 1077.  
 Omar Khayyam, Astronomer-poet of Persia, devised a calendar.  
 First and second crusades.  
 Compass introduced into Europe.

1200-1400
 Growth of Universities.  
 Roger Bacon reintroduced theory of spherical Earth into Europe and investigated nature of light, 1250.  
 Marco Polo lived in China 1275-1295.  
 Kubla Khan founded observatory in Pekin.  
 Ibn Batuta explored Asia and Africa.  
 Probable rise of Inca and Aztec cultures.  
 William of Wykeham founded Winchester College, 1393.  

1400-1500
 Prince Henry the Navigator promoted exploration, 1440.  
 Columbus set sail for India; Martin Behaim made a terrestrial globe, 1492.  
 "Pythagoreans" worked secretly in Rome.  

1500-1600
 First agitation for reform which resulted in the Gregorian calendar, 1535.  
 Apian published Caesars' Astronomy, 1540.  
 Explorations of the New World.  
 Copernicus published De Revolutionibus Orbium Coelestium, 1543. (The ghost of Aristarchus laughed.)  
 Cornerstone laid for Tycho Brahe's Observatory at Uranienburg, 1576.  

1600-1939
1609  Galileo first used his telescope; Kepler concluded his "Martian Labour."  
1666  Newton was hit on the head by an apple; Royal Society founded.  
1675  Greenwich Observatory founded.  
1682  Halley computed return of the comet which bears his name.  
1781  Herschel discovered Uranus.  
1796  Laplace enunciated his nebular hypothesis.  
1801  
First asteroid, Ceres, discovered.  
1802  Dark lines of spectrum discovered by Wollaston, subsequently charted by Fraunhofer.  
1840  First photograph (daguerreotype) taken of the Moon.  
1845  Earl of Rosse installed 6-foot reflecting telescope.  
1846  Calculations of Couche Adams in Cambridge and of Le Verrier in Paris made possible Professor Galle's discovery of Neptune.  
1859  Kirchoff applied spectrum-analysis to astrophysics.  
1900  Chamberlin and Moulton announced planetisimal theory.  
1905  Einstein first enunciated relativity theory.  
1919  100-inch telescope installed at Mt. Wilson.  
1919  Discovery of Galaxies outside the Milky Way.  
1921  Theory of expanding universe expounded.  
1930  Pluto discovered.



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