Antikythera mechanism

What is it?
It is a super astron omical "computer" 2000 years ago.Astronomers use it to calculate the cycles of celestial bories, Its advancemt has not been surpassed for thousads of thousands of years since it was made.

Question 3  When did it happen? Where did I find it?
1901 in  Antioch IsIand Greece.

Question 4 What is it made up of?
The device consists of controllable copper gears (more than 30).crank and dial.

Question 5 What is it used for?
Astronomical calendar.