Everywhen is a free live map of day and night. The shaded part of the world is where the sun has already set, drawn from the sun's real position, together with the local time in more than 200 cities. There is nothing to install and no account to create.
The line between day and night is called the terminator. Because the Earth's axis is tilted by about 23.4°, its shape changes through the year: around the March and September equinoxes it runs almost straight from pole to pole, and around the June and December solstices it bends into a deep curve, which gives the polar regions the midnight sun or the polar night. The map recalculates it every few seconds, so you can watch dawn move west across the continents.
Switch between a flat map that wraps around sideways and a 3D globe you can spin. On the flat map, flight paths look curved because the shortest route between two cities follows a great circle; on the globe the same routes look straight.
Click any city to see its local time, the time difference from you, sunrise, sunset and day length. The world clock lists every city with daylight saving time already applied, and the meeting planner finds the hours that suit people in several cities at once.
Ambient mode turns the map into a calm screen for working or studying: a large clock, a focus timer with optional breaks, and soundscapes such as rain, waves or a campfire, or lo-fi music.