Decoding the Heavens: Solving the mystery of the world’s first computer by Jo Marchant

A brilliant book for a fascinating topic: The Antikythera Mechanism. This is an ancient device (2K years old approx.) thought to model the heavens (sun, moon, planets), predict eclipses, act as a calendar, and many other possible uses. It uses an intricate gear system which is delicate and precise at the same time. 

In Decoding the Heavens Marchant narrates the story of the Mechanism’s extraction from a shipwreck and subsequent storage at the National Archaeological Museum in Athens where it captured the interest of Valerios Stais, curator and director. It then goes on to describe the main attempts to decipher its function. This takes maybe a little under two thirds of the book. In chronological order, we follow the studies of Derek de Solla Price, who believed the device was a calendar computer, Michael T. Wright, who described it as a planetarium and Tony Freeth, who believed it was an eclipse predictor. The narrations are very interesting and at moments thrilling. The stories dive into history, astronomy, mathematics and astrology, going back as far as the Babylonians who were experts in arithmetic. Freeth’s story was particularly interesting as he used advanced X-Ray and CT imaging technologies to take high resolution images of the object and of the tiny/microscopic inscriptions embedded which are now believed to be instructions. 

There is no definitive conclusion as to the function of the mechanism. The Antikythera mechanism remains are extremely decayed and with pieces, or parts, which have never been found. However, from the investigations of the 3 experts (and more), we can be confident that it is a combination of systems for astronomical positions, eclipse prediction and calendar display, as well as other uses like the timing of Greek athletic games! 

The final chapter of the book tries to identify the designer/builder of the mechanism. Marchant enumerates a few possibilities: Hipparchus, Posidonius and Hero. She goes through what is known about their work and expertise and explains how or why they “could” be the ones. 

With all this information, it is evident that so much knowledge has been lost across human history. We should question assumptions, such as clocks and complex gear systems were invented in Europe in the 13th century. Likely they were not. All that knowledge must have been hidden somewhere waiting to be rediscovered. If the Greeks were capable of building such a mechanism, with amazing and precise craftmanship, and advanced astronomical and mathematical knowledge 2K years ago, it suggests that others before them had been building similar devices for centuries, beginning with simpler mechanisms and progressing, step by step, towards advanced mechanisms like the Antikythera. If we could only find more evidence. This is exactly the kind of thing that makes me wish someone invented a time machine! 

Excellent read. Recommend.