Tiny Moon – Swift library to calculate the moon phase

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

A tiny Swift library to calculate the moon phase for any given date, works super fast, and works completely offline. - mannylopez/TinyMoon

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…

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