Moon Phase Algorithms for C, Lua, Awk, JavaScript, etc.

In plain words

Moon Phase Algorithms is a collection of computational tools for calculating lunar phases across multiple programming languages including C, Lua, Awk, and JavaScript. Designed for developers and astronomers who need to programmatically determine moon phase data, it provides algorithms that can be integrated into various applications. The multi-language support makes it accessible to projects regardless of their technology stack.

written from the facts on this page · September 2026

From the sources

These functions take a time as an input (usually in unix epoch seconds or the languages official way of doing time), and return the "age" of the moon in radians, such that (1-cos(x))/2 returns the illuminated fraction of the moons surface, this indirection is needed because across a full cycle, the same illuminated percent appears more than once, the first and third quarter are a good example. All implementations contain test cases showing how to get the illuminated fraction and percent using the code. When the age of the moon is converted into a range between [0,1] . You can then get the age of the moon in days by multiplying it by ~29.5. You can also get the "index" of the phase, required…from github.com

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