The Solar Dial consists of a 24-hour dial with 12 (noon) at the top and 24 (midnight) at the bottom. An hour hand moves once around the dial per day, and attached to the hour hand is miniature representation of the Sun. The portion of the dial that’s in light blue represents the number of daylight hours, and the portion in dark blue, night; the boundaries between each section mark sunrise and sunset. Opposite the Sun on the 24-hour hand is a smaller dial which shows the hours and minutes, in either an analog or digital format. The four corners of the watch face are taken up with customizable complications (in my case, from the upper left clockwise: world time, date, activity tracker, and workout)… More here.
Some very information words in this article. I learned a lot.