Daylight Terminator
The daylight terminator shows which part of the planet are in day or night.
The configuration settings determine the transparency of the shape, and the z-index - which order the daylight terminator appears in relation to the other map layers.
By default the curve represents the current date and time, and should update every second. It is also possible to configure it to display the appropriate shape and position for a specific date and time, by dragging in a field of type DateTime into the Daylight Date & Time field area: