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Four Light Seasons
The Light Calendar divides the year into four seasons, each centred between two astronomical solar events (Winter Solstice → March Equinox → Summer Solstice → September Equinox → Winter Solstice).
These seasons reflect actual daylight behaviour rather than temperature or cultural convention.
Because Earth’s orbital speed varies throughout the year, the four seasons have slightly different lengths:
- Waxing Light (Vorfrühling, Q1): approx. 90.9 days
- Light (Frühsommer, Q2): approx. 93.2 days
- Waning Light (Frühherbst, Q3): approx. 91.8 days
- Darkness (Frühwinter, Q4): approx. 89.4 days
These variations arise naturally from the elliptical orbit: Earth moves faster near perihelion (January) and slower near aphelion (July).
- Waxing Light (Vorfrühling): ca. 4 February – 5 May
- Light (Frühsommer): ca. 6 May – 6 August
- Waning Light (Frühherbst): ca. 7 August – 6 November
- Darkness (Frühwinter): ca. 7 November – 3 February
Small ±1 day variations occur when translating it to the Gregorian calendar, depending on the exact astronomical fixpoints.
Light increases rapidly; days grow noticeably longer.
Peak daylight; longest days of the year.
Rapid decrease in daylight; transition toward darker months.
Dark plateau around the solstice with minimal change in daylight.
The Light Calendar works identically on the Southern Hemisphere.
Only the assignment of the seasons shifts by half a year:
- Northern Waxing Light (Southern Waning Light)
- Northern Light (Southern Darkness)
- Northern Waning Light (Southern Waxing Light)
- Northern Darkness (Southern Light)
The season lengths (approx. 90–93 days) remain the same, because they are determined by Earth’s orbit — which is identical worldwide.
Thus, the Light Calendar matches actual daylight behaviour on both hemispheres.