import { EphemerisEngine, PlanetPosition } from './ephemeris.js';
import { DateTime } from 'luxon';
export declare class EphemerisInterpolator {
    private snapshots;
    private ephemeris;
    private stepMs;
    private startTime;
    private endTime;
    constructor(ephemeris?: EphemerisEngine);
    /**
     * Pre-calculates positions for a time range.
     * @param start Start Time
     * @param end End Time
     * @param stepHours Step size in hours (default 24h for slow, 1h for fast?)
     *                  For 60fps UI, we might need 6h steps and Cubic Spline, but Linear on 12h is decent.
     */
    cacheRange(start: DateTime, end: DateTime, stepHours?: number): Promise<void>;
    /**
     * Gets interpolated positions for a specific time.
     * @param time DateTime
     */
    getFrame(time: DateTime): PlanetPosition[];
    private unpack;
}