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400 BCE
astrnomy is the oldest science
mercury venus mars jupiter and saturn were well -know in ancient times because they can be easily seen sen with the nakedeye and their movements are easily differentiated from stars which are fixed position . -
300 BCE
aristarchus greek astronomer
suggested that the earth revolved around the sun . -
200 BCE
hiparchus greek astronomer
classified the stars according to their apparent brightness -
Sep 13, 1543
copernicus
published his heliocentric miodel according to which the planets revolved around the sun -
tyco bryhe
carried out very detailed observation of the planets -
galileo
used the telescope for the first time to observe the sky -
isaac newton
built the first telescope using mirrors instead of lenses -
isac newton
his book the principles of natural philosophy in which he explained the laws governing the moment of the planets -
edmund helley
explaind newtons laws and predicted the turn of the comet in 1758 -
w.herschel
discovered the planet uranus -
F.W. Bessel
measured the distence from a star for the first time using geometric geometric -
adams galle and leverrierr
lead to discover neptune -
E.PHuble
proved that some of the nebulas seen in the sky are in fact independent galaxies -
C.Tombaugh
discovered pluto -
extra-solar plnets
the discovery of the firts extra-solar planets
