Daylight

Scrub the year. Copenhagen’s day shrinks hard. Cairo barely blinks.

Copenhagen

55.7°N

daylight—

Cairo

30.0°N

daylight—

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Curve anchored to published solstice lengths (Daylite / WeatherHack): CPH ≈ 17h33 / 7h01 · Cairo ≈ 14h05 / 10h12. Mid-year values follow a simple seasonal cosine — Lab toy, not an ephemeris.