import { default as Quaternion } from './quaternion.js';
import './date_extensions.js';
/**
 * Greenwich mean sidereal time
 *
 * @param {Number} jd_ut1 The Julian date, referenced to UT1
 * @returns {Number} Greenwich mean sidereal time, radians
 */
export declare const gmst: (jd_ut1: number) => number;
/**
 * Greenwich apparant sidereal time
 *
 * @param {Number} jd_ut1 the Julian date, referenced to UT1
 * @returns {Number} Greenwich apparant sideral time, radians
 */
export declare const gast: (jd_ut1: number) => number;
/**
 * Compute rotation from TEME frame to ITRF frame
 * TEME is the frame output by the SGP-4 orbit propagator
 * ITRF is the International Terrestial Reference Frame,
 * and is a Cartesian Earth-Fixed frame from which geodetic coordinates
 * (latitude, longitude) can be computed
 *
 * @param {Date} thedate Date for which to compute rotation
 * @returns {Quaternion} Quaternion representing the rotation
 */
export declare const qTEME2ITRF: (thedate: Date) => Quaternion;
/**
 * Compute rotation from GRCS frame to ITRF frame
 * GCRS is an inertial frame very close to J2000
 * ITRF is the International Terrestial Reference Frame,
 * and is a Cartesian Earth-Fixed frame from which geodetic coordinates
 * (latitude, longitude) can be computed
 *
 * @param {Date} thedate Date for which to compute rotation
 * @returns {Quaternion} Quaternion representing the rotation
 */
export declare const qGCRS2ITRF: (thedate: Date) => Quaternion;
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