The Daylight layer allows you to follow the sun. Like all layers, you can combine it with any of the available Map Types or other MarineTraffic features (Fleets, Filters, Layers) to get the information you want directly on the Live Map.
For your information, Daylight is defined as the natural light of the day that reaches us, when the sun is above the horizon and the sunlight has been filtered through Earth's atmosphere. Now, with a click of a button, you can instantly find out which part of the world is in the dark and which is watching the sun rising!
To activate it, simply click on the corresponding checkbox in the Layers section of the Live Map Toolbar.