The terminator is the interface.
Designing daylight as information instead of decoration.
The day/night boundary in Across Hours started as a visual effect and ended up carrying a large part of the product idea. Once time is made spatial, the solar terminator is no longer background treatment — it is information.
Numbers answer a different question.
A clock can tell me that it is 18:40 somewhere else. It does not immediately tell me whether another person is beginning their evening, sitting in full daylight or already well into the night.
Across Hours uses geography and sunlight to make that relationship visible before the user has to interpret an offset. The globe is useful when it reduces translation, not when it simply makes time prettier.
The boundary had to feel natural.
A hard line between day and night reads like a data mask. A very broad gradient loses the sense of where the transition is happening. The visual system settled on a restrained, smooth twilight transition calibrated as one continuous boundary.
That decision sounds small, but it changed the readability of the whole globe. The terminator needed enough softness to feel planetary and enough definition to remain legible as information.
Interface can be environmental.
Not every piece of information needs a panel, badge or label. Sometimes the environment itself can carry meaning. That is the principle I want to keep from this project: if the visual system can explain the state directly, adding interface chrome may make the product less clear rather than more clear.