Alhazen and Galileo Galilei

Alhazen and Galileo Galilei     

         
      100 years ago people did not know as much as we do these days. What about 1000 years ago? At that time people were thinking that the Earth is the center of the world and the sun moves around it . Until  Alhazen invented optics science  and Galileo used it to  prove that was not true .  Despite the fact that Alhazen and Galileo had  similarities , they also had some differences.

         According to psychologists the backgrund is a mean factor in any personalty. In the same way , Alhazen was born  in Basra in 956, which known as Islamic golden age. He was educated in Bagdad, after that he moved to Cairo and worked there as civil servant. Next he wrote his book "Book of optics" .Also he tough at Alazhar  university . However, Galileo Galilei was born  in 1564 ,in Pisa .He was educated in the Camaldolese Monastery at Vallombrosa , southeast of Florence. In 1581 he diced to change his major from medicine to mathematics and nature philosophy.  Then he had been tough at University of Padua until 1610 .  

        Galileo was interested in  Astronomy , but Alhazen was not interested in that field  . Actually ,Alhazen spent his live studying optics science. they both were the most intillegnt scientists in their field . In fact without ALhazen book ,Galileo would not be abel to prove his ideas about Astronomy . Because the telescope  which Galileo had been used it besad on Alhazen book. 
     
       Similarly, Alhazen and Galileo fought false beliefs . In Alhazen case , people thought the light comes from eyes to things and that way people could see. Alhazen did not believe that and he searched and did experiments in animals eyes  until he found that eyes receive lights, then  reflect it outside and that why we can see .   Although , in Galileo time, people believed that the earth is the center of the world and the sun moves around it. As alhazen , Galileo made his research ,and by his telescope he saw that many planets have more than one moon move around them , and they all include the earth move around the sun.
      
       After what I found about  ALhazen and Galileo, I realized  that they put the corner ston in Astronomy and optics science. After that many scientists  have been used them in all possible areas. Although , after 100 years, people will know more and more than what we know now.