The Moon: Calendar Moon Phases establishes itself as a specialized astronomical utility for iOS, offering comprehensive lunar tracking capabilities spanning an unprecedented date range from 0001 to 2100. Developed by Vitalii Gryniuk, the app fills a niche for users requiring precise lunar data beyond typical calendar applications, positioning itself as a serious tool for astronomical reference rather than casual moon gazing. The application's core functionality centers on seven primary lunar metrics: moonrise/moonset times, phase visualization, lunar days, illumination percentage, Earth-moon distance, and positional coordinates. These are supplemented by bonus solar calculations including sunrise/sunset times, altitude, azimuth, and solar distance measurements. The interface presents data through both daily views and calendar formats, allowing users to track lunar cycles across centuries with location-specific accuracy. Technical implementation appears robust, handling complex astronomical calculations without apparent performance issues according to user reports. User experience reflects a utilitarian design philosophy prioritizing data clarity over visual embellishment. The interface presents information through clean, scrollable screens with numerical data and minimal graphical elements. Real-world usage patterns suggest primary use cases include astronomical photography planning, spiritual/mythological lunar tracking, educational purposes, and cultural event planning tied to lunar cycles. The bilingual support (English/Russian) expands its accessibility across geographic regions. User feedback trends consistently highlight reliability and data comprehensiveness, with multiple long-term subscribers praising the app's stability. Reviewer 'puzzledpieces' (2025-08-21) notes years of crash-free operation, while 'gsmadonna' (2025-08-08) emphasizes educational value in learning lunar terminology. However, critical feedback from 'Dot Suzie' (2025-07-10) indicates potential feature abandonment concerns regarding non-core functionality like wolf howl notifications, suggesting developer attention may prioritize astronomical accuracy over ancillary features. The application demonstrates clear strengths in historical data range and computational accuracy, making it particularly valuable for researchers, historians, and serious astronomy enthusiasts. Limitations include sparse visual representations of lunar phases and minimal interactive elements. Ideal use cases involve academic reference, event planning requiring historical lunar data, and professional applications where precision outweighs aesthetic considerations. The subscription model appears justified given the specialized nature of the calculations and long-term maintenance requirements for astronomical data.