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Gordon’s Sun Clock and Light Calendar

Welcome to the official documentation of Gordon’s Sun Clock and Light Calendar, a natural, astronomy-based system for understanding time, seasons, and the rhythm of light.

This project introduces two complementary components:

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1. The Sun Clock ☀️

A single-hand clock with a dial that changes daily. It visualises solar time and the positions of celestial bodies.
Unlike ordinary clocks, which are based on man-made conventions (e.g. daylight saving time), it follows the natural rhythms of the Sun and the seasons.

But it still shows the official time.

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2. The Light Calendar ☀️

A redesigned year structure aligned with astronomical reality. It features:

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• Four natural Light Seasons

Each defined by equal intervals between the year’s four astronomical solar events (Winter Solstice, March Equinox, Summer Solstice, September Equinox):

• Waxing Light (Wachsen) – early February to early May
• Peak Light (Licht) – early May to early August
• Fading Light (Schwinden) – early August to early November
• Darkness (Dunkelheit) – early November to early February

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• Twelve new Light Months

New February (Neufebruar) to New January (Neujanuar), with harmonized lengths (29/30/31 days) following the astronomical balance.

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• A natural Moon Counter

Each of the year’s 12–13 moons is numbered (M1–M13), providing lunar orientation without needing a separate lunar calendar.

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• Progressive adoption (3 levels)

The system can be used in three independent stages:

1. Keep Gregorian calendar + add Light Seasons + optional Moon Counter
2. Keep Gregorian year start + adopt Light Months (Neufebruar…Neujanuar)
3. Fully adopt the Light Calendar with the year beginning at 1. New February (1. Neufebruar)

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Documentation Structure

Sun Clock

• Introduction
• Astronomical Basis
• Daily Light Phases
• Technical Implementation
• Display Modes
• Interpretations & Use Cases

Light Calendar

• 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

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Purpose of This Project

Gordon’s system aims to reconnect calendar and clock with:

• natural light changes
• real astronomical events
• intuitive human perception of time

The results are:

• more meaningful seasons
• more balanced months
• an elegant and practical lunar integration
• and optionally a completely new solar year structure

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Start Exploring

→ Light Calendar
→ Sun Clock