-
4 BCE
revolution of the sun
the greek astronomer aristarchus of samos suggested that the earth revolved around the sun. -
2 BCE
classifying stars
the greek astronomer hirpachus start classifying stars according their brightness. -
1 BCE
big bang
the big bang was a big explotion of a small point of energy that created the matter -
2
geocentric model
was invented by ptolemy that the model tell us that the planets and sun was revolve around earth -
Sep 13, 1543
heliocentric teory
was invented by copernicus that tell us that the planets revolve around earth -
birth of modern astronomy
galileo used a telescope for first time to observe the night sky. -
issac newton
he built the first telescope using mirrors instead of lenses. -
discover uranus
w. herschel discoverd uranus
