Hegira by Greg Bear
The novel “Hegira” by Greg Bear was published for the first time in 1979 and revised for a new edition in 1987. Hegira is a planet with a diameter six times the Earth. Its inhabitants can read the history and culture of the Firstborn on one thousand kilometers tall obelisks but chronologically theose information go from the bottom up so people can reach only the oldest part of the Earth’s history on the first few miles.

