The Moon: Calendar Moon Phases is an iPhone app developed by Vitalii Gryniuk. This is a free lunar calendar that can be used universally for any locations from 0001 to 2100 years. It is a comprehensive lunar calendar with a user-friendly interface that displays the moonrise, moonset, moon phases, lunar days, illumination, distance, and position. The app also includes additional features such as sunrise, sunset, altitude, azimuth, and distance as a bonus. The app supports English and Russian languages.

The app is easy to use; users can view day info by tapping on the "Day number" and change the year on the calendar by tapping on the year number. Apart from the free version, users can also unlock the calendar subscription. The subscription renews automatically each year, and the payment is charged to the user's iTunes account within 24-hours before the end of the current period. Users can turn off the auto-renewal feature by accessing their account settings after purchase. The app's terms of use and privacy policy can be accessed through the links provided.

Overall, The Moon: Calendar Moon Phases is a useful app for anyone interested in lunar calendars. Its comprehensive features and user-friendly interface make it easy to use and navigate.