/**
 * Time Manager for Orbital Simulations
 *
 * Manages simulation time, time scaling, and animation loop for orbital mechanics.
 */
export type TimeUpdateCallback = (julianDate: number, realDate: Date) => void;
export declare class TimeManager {
    private julianDate;
    private timeScale;
    private isPaused;
    private lastUpdateTime;
    private callbacks;
    private intervalId;
    constructor(startDate?: Date);
    /**
     * Start the time simulation loop
     */
    start(): void;
    /**
     * Stop the time simulation loop
     */
    stop(): void;
    /**
     * Update tick
     */
    private update;
    /**
     * Advance simulation time
     *
     * @param deltaMs - Milliseconds elapsed in real time
     */
    advance(deltaMs: number): void;
    /**
     * Pause time progression
     */
    pause(): void;
    /**
     * Resume time progression
     */
    play(): void;
    /**
     * Toggle pause/play
     */
    togglePause(): void;
    /**
     * Set time scale (speed multiplier)
     *
     * @param scale - Time scale (1 = real-time, 10 = 10x speed, etc.)
     */
    setTimeScale(scale: number): void;
    /**
     * Get current time scale
     */
    getTimeScale(): number;
    /**
     * Set simulation date
     *
     * @param date - JavaScript Date object
     */
    setDate(date: Date): void;
    /**
     * Get current simulation date as Julian date
     */
    getJulianDate(): number;
    /**
     * Get current simulation date as JavaScript Date
     */
    getDate(): Date;
    /**
     * Check if time is paused
     */
    getIsPaused(): boolean;
    /**
     * Register a callback for time updates
     *
     * @param callback - Function to call when time updates
     */
    onUpdate(callback: TimeUpdateCallback): void;
    /**
     * Unregister a time update callback
     *
     * @param callback - Callback function to remove
     */
    offUpdate(callback: TimeUpdateCallback): void;
    /**
     * Notify all registered callbacks of time update
     */
    private notifyCallbacks;
    /**
     * Get time state for serialization
     */
    getState(): {
        julianDate: number;
        timeScale: number;
        isPaused: boolean;
        date: string;
    };
}
//# sourceMappingURL=TimeManager.d.ts.map