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3,000 B.C. England The main stones of Stonehenge are put into place.

2,000 B.C. Egypt and Mesopotamia The First solar-lunar calendars are invented.

280 B.C. Samos (Alexandria) Aristarchus suggested the Earth revolves around the Sun and provided the first estimation of the distance between the Earth and the Sun.

240 B.C. Cyrene (now Shahhat, Libya) Eratosthenes measured the circumference of the earth using the suns angles and shadows from different spots on Earth.

130 B.C. Greece Hipparchus developed the first acccurate star map and star catalogue with over 850 of the brightest stars.

140 A.D. Greece Ptolemy suggested his geocentric theory of the universe.

813 A.D. Iraq Al Mamon founded the Baghdad school of astronomy.

1543 A.D. Poland Copernicus published his heliocentric theory of the Universe.

1572 A.D. Denmark Tycho Brahe discovers a supernova in the Cassiopeia Constellation.

1603 A.D. Germany Johann Bayer came up with the idea to designate stars with greek letters, a method that is still used in the modern day.

1608 A.D. Netherlands Hans Lippershey invented the telescope.

1609 A.D. Italy Galileo used the telescope for astronomical purposes and discovered four of Jupiter's current 63 known moons, the Milky Way galaxy and the Moon's craters.

1609 A.D. Germany Kepler introduces his First and Second Planetary laws of motion.

1619 A.D. Germany The Third Law of Planetary Motion is publicized Kepler, which states, The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.

1666 A.D. Italy Cassini noted that there are polar ice caps on the surface of Mars.

1668 A.D. England Newton built the world's first reflecting telescope.

1669 A.D. Italy Geminiano Montanari discovers the star Algol and notices that it doesn't have a steady brightness.

1675 A.D. France Cassini discovered that Saturns "ring is actually

1687 A.D. England Newton published his theory of universal gravitation.

1705 A.D. England Halley was able to correctly predict the return of a comet. This accurate prediction would later cause that comet to be named after Halley (Halleys Comet).

1781 A.D. England Herschel Discovered the planet known as Uranus.

1801 A.D. Italy Piazzi discovered the first recorded asteroid, Ceres.

Johann Galle observed and discovered Neptune. This couldn't have been done though, without the help of other Astronomers, Joseph Leverrier and John Couch Adams.