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200,000 BCE
The BIg Bang
Billion of years ago in the center of the Universe the Big Bang probably occurred. -
2000 BCE
First solar-lunar calendars
2,000 B.C. in Egypt and Mesopotamia first solar-lunar calendars -
280 BCE
The Earth around the sun
280 B.C. in Samos (Alexandria) Aristarchus suggests the Earth revolves around the Sun. He provides first estimation of Earth-Sun distance. -
240 BCE
The circumference of the Earth
240 B.C. in Cyrene (now Shahhat, Libya) Eratosthenes measures the circumference of the earth with surprising accuracy -
130 BCE
The first stars maps
130 B.C. in Greece Hipparchus develops the first acccurate star map and star catalogue with over 850 of the brightest stars. -
45 BCE
Julian Calendar
45 B.C. in a Roman Empire Introduction of the Julian calendar, a purely solar calendar, to the Roman Empire -
Sep 6, 1054
Supernova in Taurus
1054 A.D. in China, Chinese astronomers observe supernova in Taurus -
Sep 6, 1120
Construction of an observatory in Cairo
1120 A.D. in Egypt Construction of an observatory in Cairo was begun in 1120 A.D. This is possibly the first observatory built in Medieval Islam. Unfortunately, the patron of the observatory was found guilty of several crimes including communication with Saturn, and was sentenced to death. The observatory was then destroyed in 1125 A.D. and the personnel were forced to flee for their lives. -
Sep 6, 1400
Geocentric theory
140 A.D. in Greece Ptolemy suggests geocentric theory of the universe in famous work Mathematike Syntaxis. -
Sep 6, 1543
Heliocentric theory
1543 A.D. in Poland Copernicus publishes his heliocentric theory of the Universe. -
Sep 6, 1572
Supernova in Cassiopeia
1572 A.D. in Denmark Tycho Brahe discovers a supernova in constellation of Cassiopeia. -
Sep 6, 1582
Gregorian calendar
1582 A.D. Italy Pope Gregory XIII introduces the Gregorian calendar -
Discover of the Milky Way and 4 Jovian moons
1609 A.D. Italy Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy. -
Cassini Division
1675 A.D. France Cassini discovers that Saturn's rings are split into two parts, so that today the gap is called the "Cassini Division". -
Invents the telescope
1608 A.D. Netherlands Hans Lippershey, a Dutch spectacles maker invents the telescope.
