Coastal Chart — a real world-map voyage across 6 real coastal biomes

Coastal Chartclick any site marker to drill in

1999-01-01

drag to pan · scroll/pinch to zoom · click a site marker to open its detail vignette

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slide to unlock

Voyage clock

Date

Speed10 d/s

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The six sites

Marker brightness = current real day length at that site (bright = long day, dim = short day) — the hemisphere split is visible before you click anything.

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Latitude—

Day length now—

Local season—

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Fauna

Flora

Six real coastal sites at their real signed latitude/longitude, one shared solar-geometry formula, one simulated Gregorian calendar. Hand-written for this repo — self-contained, no dependencies, no CDN. Test hook: window.__chart.