/**
 * Converts a UTC date to Julian Date.
 * @param date UTC date
 * @returns Julian Date
 */
export declare function utcToJulianDate(date: Date): number;
/**
 * Converts a Julian Date to a UTC date.
 * @param jd Julian Date
 * @returns UTC Date
 */
export declare function julianDateToUTC(jd: number): Date;