Antikythera Mechanism-said to be the oldest computer on Earth, publicized a century ago in a shipwreck near Crete , and was built in the second century. This oldest computer was said to be restored in 1900-1901 of the ancient Antikythera demolish. This old computers value and density is not really understood until decades afterwards. Its said creation period is estimated among 150 and 100 years BC old. Previous reports of this year confirmed that it was very old astronomical calendar, but now everyone knows the full capability of this old machine.
The old machine is notable for the point of miniaturization and density of its old parts, which is comparable to the 19-century old clock. It has over 30 old gears, although Michael Wright has suggested up to 72 old gears, with teeth formed by equilateral triangles. When a time was entered by means of an eccentric (now lost), the mechanism projected the position of the Sun and Moon or other astronomical information such as the locations of planets. Since the objective was the position of astronomical bodies in relation to the celestial sphere with indication to the location of the viewer on the Earth's surface, the new equipment is based on the geocentric model.
