The earth turn around in clock in a day.
So you can understand time of the world at glance.
Earth case helps that you communicate with the world.
Enjoy the earth drawn with beautiful CG by pre-rendering.

You need install this app via play store on your watch device when you use Wear OS or Android wear 2.0.
You can found this app how run to play store and swipe down to area of Apps to your phone in your watch device if you installed this app to your phone device.
Or you can install this app to your wear device via Play store on the browser.