Live second-by-second countdowns until sunset and until it's fully dark — 165 US cities. Type to filter, or start with Miami:
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The live countdowns on each city page show exactly how long until sunset, ticking every second, computed from NOAA solar equations for that city’s coordinates.
It is fully dark when civil twilight ends and the sun is 6 degrees below the horizon — roughly 25 to 35 minutes after sunset, tracked by the second countdown on each city page.
Civil twilight is the span after sunset when the sun is less than 6 degrees below the horizon — there is still enough light to see, but it grows steadily darker. When it ends, it is fully dark.