Table of Contents:
  • <p><span>Earth’s calendar emerges from several measurable periodic motions: daily rotation, yearly revolution, stellar reference rotation, and long-term axial precession. These motions can be described as interacting “clocks” operating at different speeds. The geometric circle (360°), the tropical year (365.2422 mean solar days), the sidereal rotation count (366.2422 rotations per tropical year), and axial precession (~25,772-year cycle) form a coherent phase hierarchy. This paper presents the algebraic relationships among these quantities and explains their physical meaning in accessible terms. Base-12 representation is included as an efficient angular subdivision system. The result is a structured description of Earth’s calendar as layered, interacting cycles.</span></p>