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Day & night

Where it is dark right now, drawn as the three twilights and full night instead of a single day-night line.

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What it shows

Where it is dark right now, drawn as the three twilights and full night instead of a single day-night line. It is calculated from the position of the sun, so it needs no data feed. A slider moves the time 12 hours back or forward.

Where the data comes from

Computed in the browser from the solar position; no external data, always current.

Reading the map

Civil twilight (sun 0 to -6°, light enough to read), nautical (-6 to -12°), astronomical (-12 to -18°, the first stars) and night (below -18°), each band darker than the last.

Units Sun elevation in degrees.

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