In this seminal archaeoastronomy text, symbologist Donald J. McMahon unveils astounding revelations about the nature of the invaders of Ireland and the scope of seafaring trade in the ancient world.

Combining his expertise in symbology with a passion for mathematics and geometry, a fascination with sailing and celestial navigation, and a lifetime of experience working in metal processing and raw material management, McMahon is uniquely qualified to recognize visual and cultural patterns that have remained undiscovered for five thousand years.

In painstaking detail, the book centers...