Russian Orthodox Calendar for Sony's SmartWatch Extension. If you don't have a Sony SmartWatch, you should not install this application, but rather: https://play.google.com/store/apps/details?id=eir.synaxarion.ru
Fully in Russian, and according to the old style (Julian) calendar.
Displays the calendar of feasts and saints, as well as fasting and period of the year information. Does not require internet connection, so it will not stop working even if you are on Sinai or Mount Athos :-)
Swipe left and right to navigate through days. Tap to toggle between feast/saint and period/fasting data. Long tap to return to the current day.
Includes a SmartWatch Widget.
One should not rely too much on the fasting info displayed, talk to your priest instead.