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Gordon’s Sun Clock & Gordian Light Calendar

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:

1. Gordon’s Sun Clock

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.

1b. FAQ - Sun Clock

Frequent questions I get.

2. The Light Calendar

A calendar system aligned with solar and lunar cycles, restructuring the year according to measurable changes in light rather than arbitrary month beginnings.

Both systems are designed to make astronomical reality visible and intuitively understandable without abandoning practical usability. Parts of the Light calendar are included in Gordon's Sun Clock (the Light seasons and the Moon night calendar).

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Modern clocks and calendars rely on fixed units that are only loosely connected to astronomical reality. Noon rarely coincides with the Sun’s culmination, sunrise and sunset isn't easily accessible and months do not correspond to seasonal light behaviour. Additionally 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. Additionally the moon nights calendar provides clear lunar orientation within the current calendar.

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Purpose

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

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Start Exploring

For navigation, see section on the right/below or use the following links:

→ 1. Sun Clock
→ 1b. FAQ Sun Clock
→ 2. Light Calendar