/**
 * Converts a Date object to Julian date.
 * @param date - The date to convert.
 * @returns Julian date as a floating point number.
 */
export declare function toJulian(date: Date): number;
/**
 * Converts a Julian date to a Date object.
 * @param j - Julian date to convert.
 * @returns Corresponding Date object.
 */
export declare function fromJulian(j: number): Date;
/**
 * Converts a Date to days since the J2000 epoch.
 * @param date - Date to convert.
 * @returns Days since J2000 epoch.
 */
export declare function toDays(date: Date): number;
/**
 * Adds hours to a Date object.
 * @param date - Original date.
 * @param h - Hours to add.
 * @returns New Date object advanced by h hours.
 */
export declare function hoursLater(date: Date, h: number): Date;
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