Why Are the Pyramid Bases Nearly Perfectly Level, Even By Modern Standards?

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How did the pyramid builders achieve this?

Dig Labs Collaborative ResearchHelp us investigate these questions further. Review the current state of research surrounding this topic, suggest new sources, or share your expertise. Every contribution helps.
Dig Labs Collaborative ResearchHelp us investigate these questions further. Review the current state of research surrounding this topic, suggest new sources, or share your expertise. Every contribution helps.
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Introduction

The bases of the Egyptian pyramids are nearly perfectly level. The Great Pyramid of Giza, in particular, is level within just 5/8ths of an inch. How did the pyramid builders achieve this?