One of the most interesting and useful functions on a watch are sunrise and sunset information. It requires complex algorithms to determine the various times, because the times vary throughout the year and are a function of your location.  

That hasn’t stopped inventors from coming with ingenious ways to display this information. YES is a watch company located in California, driven by a determined inventor who has developed a series of electronic watches that display sunrise, sunset, moonset, moon rise, a second time zone and many other functions. It’s available on a crowd funding site for about $700 here.

And if you don’t want to spend that much money for the information, of course, there’s an app for that.

Sundial was first launched in 2015 and has evolved ever since to where it’s quite a clever and attractive display. It uses a graphical display to show the sun and moon sunrise and sunsets, the length of the day and other information. It also can be displayed on an Apple Watch as a complication. I’d love to see it as a full watch face. The basic but very function version is free and one with additional features costs $2.99 (one time purchase). It’s highly rated on the app store at 4.7/5.