Calculation notes & credits
Geocentric planetary positions. House placements use ecliptic longitude between cusps. The True North Node is included. Aspects between the ten planets use maximum orbs of 8° for conjunctions/oppositions, 6° for squares/trines and 4° for sextiles. Unknown-time charts use local noon and omit houses and angles.
Birthplace coordinates: GeoNames, CC BY 4.0, via cities.json. Time zones: tz-lookup and your browser’s historical IANA data via Luxon. Historical civil-time records may need independent checking. Gregorian dates supported: 1900–2100.
This application is open source under AGPL-3.0-or-later. Download application source. Download engine source. Calculation engine: swisseph-wasm and Swiss Ephemeris. License.