A bit of rehash, but some new stuff too. The thrust is that the Giza pyramids encode the 23.5 degree angle and other angle in surprising ways, and the "afterlife machine." as they call it, points to past and future changes in the tilt of the earth. The best chapter is chapter 3, "The Orion Key," which proves, I think, that there was a concerted effort by the Egyptians to recreate the patterns of the stars on the ground (i.e., the Hancock–Bauval Giza–Orion correlation theory). The rest is a stretch, to say the least. But food for thought, and more sober than some pyramid books. ( )