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Light Calendar
The Gordian Light Calendar is a solar calendar aligned with real astronomical events. It divides the year into four equal Light Seasons, and uses a simple, practical Moon Counter (M1–M13).
The system can be adopted gradually (Levels 1–3), from using just the seasons & the moon calendar to fully adopting a new year structure beginning on 1. New February (1. Neufebruar).
There are many thoughtful and creative calendar reform ideas already out there — some introduce thirteen months, others use leap weeks or highly regular mathematical patterns. These systems can be elegant and useful, especially for administrative or accounting purposes.
However, such systems also create cultural side effects — for example: a birthday that always falls on the same weekday (not everyone wants a lifelong Monday birthday) or partial detachment from the natural solar cycle.
The Light Calendar follows a different purpose: it is designed for natural coherence. Its structure comes directly from astronomical reality — the solstices, equinoxes, and the changing speed of daylight. Rather than addressing bureaucratic problems, it aims to create a calendar that makes intuitive sense, feels more natural, and helps people reconnect with nature, the Earth, the cosmos, and their own bodily rhythms.
For a simple web representation of the Light Calendar, you can also use the PHP version:
This version does not compute full astronomical precision (unlike the app), but provides a good approximation of all dates, seasons, and moon cycles — with times shown in Central European Time (ME(S)Z) for the European region.