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Abdülkadir Topkaç (b. 1954 ) is an amateur astronomer.

Life
Topkaç was born in Diyarbakır, Turkey, in 1954. After completing primary education, he became a master baker. From his youth, he was interested in astronomy. His serious work began in 1991, when he started to observe the movements of the moon through a telescope. In a 2018 interview with the Turkish newspaper Cumhuriyet, he described this moment as follows: "In 1991, I was sitting in the yard of my house one evening. The moon began to appear, and I thought to myself: 'I have been philosophizing for so long. Can I now find out how the moon rotates on its axis?'" In 1992, Topkaç bought his first telescope in Istanbul for 2500 dollars, from assets of the former Soviet Union. This telescope was destroyed when the Turkish Armed Forces carried out an operation against the PKK in the Sur district of Diyarbakır. A social media campaign was then launched to help Topkaç, and he was subsequently presented with a new telescope.

Work
In 1992, Topkaç discovered that the moon's rotation is not actually circular. The moon "wriggles like a snake". He obtained NASA's address from tourists and sent his work both to NASA and to the Scientific and Technological Research Council of Turkey.

In a 2018 interview with the Turkish news outlet 140journos, Topkaç accused Istanbul University professors of plagiarizing his work.

Family
Topkaç's wife and eight children left him in 2001, saying that he was mad.