The book "Decoding the Mechanisms of Antikythera Astronomical Device" offers a comprehensive analysis and methodology for deciphering the internal structure of the Antikythera mechanism, an astronomical device from ancient Greece. It highlights the historical development of astronomical achievements and instruments and provides a systematic approach to reconstructing the mechanics of the device. By synthesizing designs for the six lost or unclear subsystems, an innovative research approach is presented that combines modern mechanical engineering knowledge with historical standards. The designs presented and the detailed examination of the remains offer valuable insights for anyone interested in the Antikythera mechanism and seeking to identify its original structures.