Planetary calculations use Astronomy Engine 2.1.19, by Don Cross. Tropical, geocentric planetary longitudes. Birthplace data is derived from GeoNames cities15000 and administrative names, downloaded September 18, 2026, under CC BY 4.0. The dataset has been filtered and reformatted for Astraea. Historical clock conversion uses the runtime’s IANA time-zone data.
Automatic birth charts require an exact listed city and birth time, and support dates from 1900 through the present. Unlisted places, unknown or ambiguous times, and Sun/Moon sign-boundary cases require owner verification. City coordinates represent the city rather than a precise street address. The displayed planetary wheel does not include houses or the Ascendant.
Astronomy library for JavaScript (browser and Node.js).
https://github.com/cosinekitty/astronomy
MIT License
Copyright (c) 2019-2023 Don Cross <cosinekitty@gmail.com>
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