The Moon - Phases Calendar is a free Android application developed by Black Swift. It is a universal lunar calendar that covers any location from 0001AD to 2100 years. Lunar calendars are one of the oldest calendars in modern society, and they differ from solar-based calendars in that a lunar month can only be 29 or 30 days long. This app provides a wealth of information about the moon, including moonrise and moonset times, moon phases, lunar days, illumination, distance, and position. Additionally, it includes bonus features such as sunrise and sunset times, altitude, azimuth, and distance. The app is available in English and Russian.

Using the app is easy. Users can view day information by tapping on the day number, and they can change the year on the calendar by tapping on the year number. The Moon - Phases Calendar is an excellent tool for anyone interested in tracking lunar phases and moon-related information. It is especially useful for those who follow lunar-based calendars or for anyone who wants to learn more about the moon's cycles.