~2520 BCE Egyptian

Pyramid of Khafre Built

Giza, Egypt (29.9761°N, 31.1308°E)

Detailed Account

Second largest Giza pyramid, appearing taller due to its elevated position. Retains its original limestone casing at the apex. Associated with the Great Sphinx, which faces due east — aligned to the equinox sunrise. The Khafre causeway, temple, and Sphinx form an integrated astronomical observation system. The pyramid's base-to-height ratio encodes a 3-4-5 right triangle.

Geographic Context

Location Giza, Egypt
Latitude 29.976100° N
Longitude 31.130800° E
This location is at the Giza plateau — latitude 29.9792°N, matching the speed of light constant (299,792,458 m/s).