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Adoption Levels
The Light Calendar is designed for gradual and independent adoption. Its components can be used separately or combined into a complete calendar system. This allows integration without forcing an abrupt break from the Gregorian calendar.
At the first level, the Gregorian calendar remains entirely unchanged. The Light Calendar is introduced solely through the addition of the four Light Seasons: Waxing Light, Light Time, Waning Light, and Dark Time.
These seasons are derived from the solstices and equinoxes and span approximately early February to early May, early May to early August, early August to early November, and early November to early February. Because the exact astronomical events shift slightly from year to year. In practice, this variation remains within ±1 day and does not affect orientation.
At this level, the Moon Counter (M1–M13) may optionally be used independent of month structure (can be used with the gregorian year period or the light year period).
The purpose of Level 1 is to provide natural, daylight-based seasonal orientation while leaving the existing civil calendar intact.
At the second level, the Gregorian year start on 1 January is retained, but the Gregorian month structure is replaced by the Light Months running from New February to New January.
Month lengths are balanced between 29 and 31 days and follow the internal symmetry of the light year. The lunar index is integrated directly, allowing continuous lunar orientation without a separate calendar layer.
This level provides a clearer and more coherent month structure while remaining fully compatible with the Gregorian year framework.
At the third level, the complete Light Calendar is adopted. This includes the Light Seasons, the Light Months, and the integrated Moon Counter, with the year beginning on 1 New February (pre-spring).
The year start is defined astronomically as the midpoint between the Winter Solstice and the March Equinox, rounded down to midnight UTC. At this level, the Light Calendar functions as a fully astronomical civil calendar with internally consistent year length, seasonal symmetry, and lunar integration.
The adoption levels are not transitional steps that must be followed in sequence. Each level is stable on its own and can be used permanently, depending on how far natural timekeeping is intended to replace conventional structures.