Tiny Moon – Swift library to calculate the moon phase
Tiny Moon is a tiny Swift library to calculate the moon phase for any given date, works super fast, and works completely offline. All of this started when I realized that we only have 12, sometimes 13, full moon's in a year. That doesn’t seem like that many. I set out to build a MacOS app to remind me when a full moon occurs, so that I could take a moment and step outside to appreciate it. The MacOS app I ended up creating can be found at https://apps.apple.com/us/app/tiny-moon/id6502374344 along with the source code [0], all powered by the Tiny Moon library. I…
In plain words
Tiny Moon is a Swift library that calculates moon phases for any given date. It operates entirely offline with fast performance, making it suitable for developers building astronomy or calendar applications. The library was created to power a companion macOS app that reminds users when full moons occur. Available as an open-source Swift Package, it draws inspiration from existing astronomy calculation tools and emphasizes minimal, efficient design.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Tiny Moon is a tiny Swift library to calculate the moon phase for any given date, works super fast, and works completely offline. All of this started when I realized that we only have 12, sometimes 13, full moon's in a year. That doesn’t seem like that many. I set out to build a MacOS app to remind me when a full moon occurs, so that I could take a moment and step outside to appreciate it. The MacOS app I ended up creating can be found at https://apps.apple.com/us/app/tiny-moon/id6502374344 along with the source code [0], all powered by the Tiny Moon library. I knew that I wanted the app to work offline, so working with a network request was out of the picture. Taking inspiration from SunCalc [1] and Moontool for Windows [2], I decided to create my own library and wrote Tiny Moon as a Swift Package to power my app. The app tries to be as minimal as possible, does what it does very fast, and works completely offline. [0] https://github.com/mannylopez/TinyMoonApp [1] https://github.com/mourner/suncalc [2] https://www.fourmilab.ch/moontoolw/
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