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/**
 *
 * getJulianDate()
 *
 *
 * @param date - The date for which to calculate the Julian Date (JD).
 * @returns Julian Date as number - the Julian Date (JD) of the given date normalised to UTC.
 *
 */
export declare const getJulianDate: (datetime: Date) => number;
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/**
 *
 * getModifiedJulianDate()
 *
 *
 * @param date - The date for which to calculate the Modified Julian Date (MJD).
 * @returns Modified Julian Date as number - the Modified Julian Date (MJD) of the given date normalised to UTC.
 *
 */
export declare const getModifiedJulianDate: (datetime: Date) => number;
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/**
 *
 * getNumberOfCenturiesSinceJ2000()
 *
 * @param datetime - The date for which to calculate the number of centuries since J2000.0.
 * @returns number - the number of centuries since J2000.0.
 *
 */
export declare const getNumberOfCenturiesSinceJ2000: (datetime: Date) => number;
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