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Period: 100 to
History Of Astronomy AD
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140
Movments of the sun and planets
Around A.D. 140, the Greek astronomer Ptolemy solidified the geocentric model, elaborating and formalizing the view in a manner that closely approximated the movements of the sun and planets -
550
Earth spins on its axis
Aryabhata (476–550), in his magnum opus Aryabhatiya (499), propounded a computational system based on a planetary model in which the Earth was taken to be spinning on its axis and the periods of the planets were given with respect to the Sun -
Jan 1, 1000
Big observatory biult, leading to more discoveries
In the late 10th century, a huge observatory was built near Tehran, Iran, by the astronomer Abu-Mahmud al-Khujandi who observed a series of meridian transits of the Sun, which allowed him to calculate the obliquity of the ecliptic, also known as the tilt of the Earth's axis relative to the Sun -
Jan 1, 1006
Brightest supernova ever recorded in history
In 1006, Ali ibn Ridwan observed SN 1006, the brightest supernova in recorded history, and left a detailed description of the temporary star -
Jan 1, 1185
Earth orbits the Sun in 9 decimal places
Bhāskara II (1114–1185) calculated the time taken for the Earth to orbit the sun to 9 decimal places -
Jan 1, 1543
Copernicus published his book
After almost forty years of study,Copernicus published his monumental book On the Revolutions of the Heavenly Orbs in 1543, the year he died -
Jupiters moons
In 1610, Galileo discovered that Jupiter had at least four moons orbiting it with his advanced telescope -
Introduction of Western astronomy and the telescope
Detailed records of astronomical observations were kept from about the 6th century BC, until the introduction of Western astronomy and the telescope in the 17th century -
First recorded supernova
In 185 AD the Chinese recorded the first super nova in the Astrological Annals of the Houhanshu -
Mayan clender
The Mayans had a calendar by 800 AD that was more accurate than the calendar used in Europe
