/**
 * astroengine stars -- fixed stars: apparent places from the HYG-derived
 * catalog (data/fixed_stars.json; ICRS J2000 with proper motions).
 *
 * Chain: full 3D space motion (proper motion + radial velocity at the
 * parallax distance) -> ICRS equatorial -> ecliptic J2000 -> Vondrak 2011
 * precession to date -> annual aberration (classic elliptic form, as for
 * Pluto/Chiron) -> nutation. Validated against swe_fixstar fed the same
 * catalog rows: <=0.3 arcsec over 1900-2099.
 */
import { EngineData } from "./core.js";
export interface StarEntry {
    ra: number;
    dec: number;
    pmra: number;
    pmdec: number;
    rv: number;
    plx: number;
    mag: number;
    bayer: string;
}
export interface StarPack {
    provenance: string;
    frame: string;
    stars: Record<string, StarEntry>;
}
/** Constellation figure lines and labels; vertices as ecliptic J2000 (lon, lat)
 *  degrees. Built by scripts/build-constellations.mjs from d3-celestial. */
export interface ConstellationPack {
    provenance: string;
    lines: {
        con: string;
        segs: number[][][];
    }[];
    labels: {
        name: string;
        con: string;
        lon: number;
        lat: number;
    }[];
}
/** Apparent ecliptic [lon, lat] of date (rad) for a catalog entry. */
export declare function starApparent(data: EngineData, s: StarEntry, jde: number): [number, number];