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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 — 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).
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.