An epoch is one band in his chart, the stretch of roughly 400 years in which one set of keys sits in the eight locks. In other words it is one Global Cycle seen as a slice of history. The chart lists the eight locks, and Ra points out that the Sphinx locks and the Vessel locks change position from one epoch to the next in a spiraling way, so every lock keeps meeting new keys while certain combinations return in a shifted form. His phrase for it is that each epoch creates a repetition of sorts, with a shift. He uses this to read history as a whole rather than nation by nation: through the locks and keys, he says, you can understand an age. He also uses it to explain something that has puzzled anthropologists, cultures that seem to thrive and then vanish. In his reading those are epochs turning, each one demanding different ingredients from humanity.
This is not a fact, not medical advice and not a promise of healing. It is part of the cosmology Ra Uru Hu, who founded Human Design, left behind, and nobody knows exactly how it will unfold.
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