Stop shipping a 1990s C library to compute planets. Xalen is the pure-Rust, Apache-2.0 replacement for Swiss Ephemeris.
If your app does astrology, you already know the dependency. Swiss Ephemeris: a C library from the 1990s, a folder of binary .se1 data files you have to ship and locate at runtime, and a license that is either AGPL or you pay for a commercial seat. For 20 years it was the only serious option, so everyone just swallowed the cost.
That era is over. Xalen Ephemeris is a full planetary engine written in pure Rust, with no unsafe in the core engine (the only unsafe lives in the optional FFI, Node and WASM binding crates), released under Apache-2.0. No C toolchain. No data files to ship. No copyleft clause waiting for the day you try to make money. It is built to replace Swiss Ephemeris in production, not to admire it from a distance.
Python is live on PyPI and the Rust crates are live on crates.io:
# Python
