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Welcome to the official documentation of Gordon’s Sun Clock & Light Calendar, a natural, astronomy-based system for understanding time, seasons, and the rhythm of light.
This project consists of two complementary components:
A single-hand clock with a daily changing dial that visualises local solar time, daylight length, and the motion of major celestial bodies, while remaining compatible with official civil time.
A calendar system aligned with solar and lunar cycles, restructuring the year according to measurable changes in light rather than inherited conventions.
Both systems are designed to make astronomical reality visible and intuitively understandable without abandoning practical usability.
Modern clocks and calendars rely on fixed units that are only loosely connected to astronomical reality. Noon rarely coincides with the Sun’s culmination, months do not correspond to seasonal light behaviour, and daylight saving introduces artificial discontinuities.
This project follows a different principle: astronomical events define structure, and changing daylight defines rhythm.
Civil time remains readable, but the natural context becomes primary. Each of the year’s 12–13 moons is numbered (M1–M13), providing lunar orientation without needing a separate lunar calendar.
- Introduction
- Astronomical Basis
- Daily Light Phases
- Technical Implementation
- Display Modes
- Interpretations & Use Cases
- Introduction
- The Four Light Seasons
- The Twelve Light Months
- Lunar Structure (M1–M13)
- Year Start & Leap Logic
- Adoption Levels (1–3)
- Comparison with Gregorian Calendar
- Mathematical & Astronomical Foundations
The aim is not to replace civil timekeeping, but to reconnect it with natural reality.
The system allows you to see:
- when true local noon occurs
- how much daylight remains
- how seasons evolve through light, not dates
- how lunar cycles integrate naturally into the year