-
3000 BCE
BIG BANG
The Big Bang probably occurred -
2000 BCE
FIRST SOLAR CALENDAR
First solar-lunar calendars -
1120 BCE
Construction of an observatory
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 -
420 BCE
CIRCUMFERENCE OF EARTH
Eratosthenes measures the circumference of the earth with surprising accuracy! -
160 BCE
STAR MAP
Hipparchus develops the first acccurate star map and star catalogue with over 850 of the brightest stars -
Sep 13, 1572
Supernova
Tycho Brahe discovers a supernova in constellation of Cassiopeia. -
Sep 13, 1582
Gregorian Calendar
Pope Gregory XIII introduces the Gregorian calendar -
Telescope
Hans Lippershey, a Dutch spectacles maker invents the telescope -
Galileo uses the telescope
Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy. -
Laws of Planetary Motions
Kepler's First and Second Laws of Planetary Motions are announced -
Saturn Rings
Christian Huygens discovers Saturn's rings and Titan, the fourth satellite of Saturn -
Speed of Light
While in Paris, Danish astronomer Ole Romer measures the speed of light. -
Modern Astronomy
Newton publishes his theory of universal gravitation in the work Philosophiae Naturalis Principia Mathematica. This is seen to be the start of Modern Astronomy. -
Discovery of Uranus
The discovery of Uranus by Herschel -
Moons of Mars
Asaph Hall discovers Phobos and Deimos, the moons of Mars.
