I’m aware of various apps that provide sunrise and sunset in digital format, but thank you. That’s not what I’m describing. First, a single-handed 24-hour analog watch provides an immediate visual display of how time is elapsing over a full 24 hours. Then the next day you see the next 24 hours. There is no 12-hr gap in the display between AM and PM.
Adding an overlapping band on this same visual display would indicate local dawn and dusk at a glance. Any choice of civil, nautical, or astronomical would be fine, although once the underlying logic is in place it would be trivial to allow the user to select their desired preference. Again, it would provide immediate, intuitive, visual information at a glance, consistent with local conditions. This would be helpful for yard work, driving after dark, etc. “How much time do I have left to mow the lawn?”, I.e., how wide is the gap between the current time and dusk? I specifically don’t want to open a separate app, read the information in digital format, and do the math in my head.
An optional overlay of digital time, day, and date in the center might be helpful, although it would add clutter to an otherwise elegantly simply and intuitive display.
I’d be interested in further comments from others to keep the discussion going. Maybe someone will take on the task and make this available. An iOS or MacOS app with these features would be a significant step forward, although not as convenient as a glance of the wrist.