section_path: Construction/Surveys and design/Alignment to the cardinal directions
section_name: Alignment to the cardinal directions
paragraph_text: Alignment to the cardinal directions
  
  The sides of the Great Pyramid's base are closely aligned to the four geographic (not magnetic) cardinal directions, deviating on average 3 minutes and 38 seconds of arc, or about a tenth of a degree. Several methods have been proposed for how the ancient Egyptians achieved this level of accuracy: