Source: NASA/JPL Solar System Dynamics, Horizons
https://ssd.jpl.nasa.gov/horizons/
https://ssd.jpl.nasa.gov/horizons/manual.html
Target: 2060 Chiron (1977 UB), JPL#171; center 500@399 (Earth geocenter).
Quantity 31: apparent IAU76/80 ecliptic-of-date longitude, daily at 00:00 UT.
Range: 1899-12-28 through 2101-01-04, padding the UI date range 1900–2100.
Downloaded 2026-10-16; JSON response SHA256 4518f380637c245d4f89af9e0a2a33a9f14a6cff6a4daad58167d2a1c23ffabd
Longitude rounded to 7 decimals; runtime uses local cubic interpolation with wrap handling.
UT1 before 1962 and UTC thereafter follow Horizons output conventions; future time-scale conversion is predictive.
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