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/**
 *
 * The approximateed average radius of the Earth in meters.
 *
 */
export declare const EARTH_RADIUS: 6378137.8;
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/**
 *
 * The Astronomical Unit (AU) is a unit of length defined as the average distance
 * between the Earth and the Sun.
 *
 */
export declare const AU_IN_METERS: 149597870700;
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export declare const SECONDS_IN_HOUR = 3600;
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export declare const SECONDS_IN_DAY = 86400;
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export declare const SECONDS_IN_YEAR = 31556925.445;
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/**
 *
 * The speed of light in a vacuum is a fundamental physical constant that is
 * the speed at which light propagates in a vacuum.
 *
 * The speed of light in a vacuum is exactly 299,792,458 meters per second.
 *
 */
export declare const SPEED_OF_LIGHT = 299792458;
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export declare const c = 299792458;
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/**
 *
 * The previous standard epoch "J1900" was defined by international agreement to
 * be equivalent to: The Gregorian date January 0.5, 1900, at 12:00 TT (Terrestrial Time),
 * equivalent to noon on December 31, 1899.
 *
 * The Julian date 2415020.0 TT (Terrestrial Time).
 *
 */
export declare const J1900: 2415020;
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/**
 *
 * The standard epoch "J1970" is defined by international agreement to be equivalent
 * to: The Gregorian date January 1, 1970, at 00:00 TT (Terrestrial Time).
 *
 * The Julian date 2440587.5 TT (Terrestrial Time).
 *
 * This is useful because it is the "epoch" referenced to the Unix 0 time system. The
 * Unix time 0 is exactly midnight UTC on 1 January 1970, with Unix time incrementing
 * by 1 for every non-leap second after this.
 *
 */
export declare const J1970: 2440587.5;
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/**
 *
 * The currently-used standard epoch "J2000" is defined by international agreement to
 * be equivalent to: The Gregorian date January 1, 2000, at 12:00 TT (Terrestrial Time).
 *
 * The Julian date 2451545.0 TT (Terrestrial Time).
 *
 */
export declare const J2000: 2451545;
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