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@kuntay/swisseph

v0.2.2

Published

a month ago

Swiss Ephemeris 2.10.03 compiled to WebAssembly. High-precision astronomical and astrological calculations for Node.js, browsers, Deno and Bun.

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swiss-ephemeris swisseph ephemeris astronomy astrology wasm webassembly horoscope natal-chart planetary-positions

@kuntay/swisseph

Swiss Ephemeris 2.10.03 compiled to WebAssembly — planetary positions, house systems, eclipses and fixed stars for Node.js, browsers, Deno and Bun.

230 KB brotli. Works with no data files.

License: AGPL-3.0-or-later. Using this in a network service obliges you to release your application's source under a compatible license. If that does not work for you, obtain a Swiss Ephemeris Professional License from Astrodienst AG. See NOTICE.

Status

Under development — the typed API layer is being built. The WASM core is compiled and verified.

Precision without data files

The built-in Moshier theory needs no .se1 files and stays within a fraction of an arcsecond of the full JPL DE441-derived ephemeris across 1800–2399 CE — well below the precision any astrological chart is drawn to. Install @kuntay/swisseph-data when you need exact agreement with the reference implementation.

Full accuracy table and rationale in the project README.

Credits

Swiss Ephemeris is the work of Dieter Koch and Alois Treindl at Astrodienst AG, built on NASA/JPL's DE441. This package is a port, not original astronomical work. Not affiliated with or endorsed by Astrodienst AG.