Moon Calendar is a free Android app developed by Polyariz that provides detailed information about the lunar calendar, solar and lunar eclipses, phases and illumination of the moon, and the sign of the zodiac for the Sun and the Moon at a given time. The app also offers information about the duration of day and night, the lunar day determination for a given calendar date, and the ability to find the location on the map and input the coordinates manually. Additionally, the app includes information about equinoxes and solstices, perigee and apogee, supermoon and micromoon, civil, nautical, and astronomical twilight, astronomical or solar noon, and the "golden" or "magic" hour and "blue hour."

Moreover, Moon Calendar also provides information about Chinese astrology, including the dates of commencement of the new year on the Chinese Lunisolar calendar, the full name, and the characteristics for the Chinese year of Feng Shui, and lunar months. The app also includes the dates for the celebration of Easter: Orthodox (old and new style), Catholic, and Jewish Passover (Pesach). The app is a comprehensive lunar calendar that provides all the necessary information for the users to plan their activities based on the lunar cycle.