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import type { EclipticCoordinate, EquatorialCoordinate } from './common';
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export declare const SOLAR_TROPICAL_YEAR: 365.242189;
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/**
 *
 * getSolarMeanAnomaly()
 *
 * The Sun's mean anomaly is the angle between perigee and the Sun's current position.
 *
 * @param date - The date to calculate the Sun's mean anomaly for.
 * @returns The Sun's mean anomaly at the given date.
 *
 */
export declare const getSolarMeanAnomaly: (datetime: Date) => number;
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/**
 *
 * getSolarEquationOfCenter()
 *
 * The equation of center is the difference between the mean geometric longitude
 * and the mean anomaly.
 *
 * @param date - The date to calculate the Sun's equation of center for.
 * @returns The Sun's equation of center at the given date.
 */
export declare const getSolarEquationOfCenter: (datetime: Date) => number;
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/**
 *
 * getSolarMeanGeometricLongitude()
 *
 * The mean geometric longitude for the Sun is the angle between the perihelion
 * and the current position of the Sun, as seen from the centre of the Earth.
 *
 * @param date - The date to calculate the Sun's true geometric longitude for.
 * @returns The Sun's true geometric longitude at the given date.
 *
 */
export declare const getSolarMeanGeometricLongitude: (datetime: Date) => number;
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/**
 *
 * getSolarTrueAnomaly()
 *
 * The true anomaly for the Sun is the angle between the perihelion and the
 * current position of the Sun, as seen from the centre of the Earth, corrected
 * for the equation of center.
 *
 * @param date - The date to calculate the Sun's true anomaly for.
 * @returns The Sun's true anomaly at the given date.
 *
 */
export declare const getSolarTrueAnomaly: (datetime: Date) => number;
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/**
 *
 * getSolarTrueGeometricLongitude()
 *
 * The true geometric longitude for the Sun is the angle between the perihelion
 * and the current position of the Sun, as seen from the centre of the Earth,
 * corrected for the equation of center.
 *
 * @param date - The date to calculate the Sun's true geometric longitude for.
 * @returns The Sun's true geometric longitude at the given date.
 *
 */
export declare const getSolarTrueGeometricLongitude: (datetime: Date) => number;
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/**
 *
 * getSolarEclipticLongitude()
 *
 * The ecliptic longitude for the Sun is the angle between the perihelion and
 * the current position of the Sun, as seen from the centre of the Earth,
 * corrected for the equation of center and the Sun's ecliptic longitude at
 * perigee at the epoch.
 *
 * @param date - The date to calculate the Sun's ecliptic longitude for.
 * @returns The Sun's ecliptic longitude at the given date.
 *
 */
export declare const getSolarEclipticLongitude: (datetime: Date) => number;
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/**
 *
 * getSolarEclipticCoordinate()
 *
 * The ecliptic coordinates of the Sun are the Sun's position in the sky as seen
 * from the centre of the Earth, corrected for the equation of center and the Sun's
 * ecliptic longitude at perigee at the epoch.
 *
 * @param datetime - The date to calculate the Sun's ecliptic coordinates for.
 * @returns The Sun's ecliptic coordinates at the given date.
 */
export declare function getSolarEclipticCoordinate(datetime: Date): EclipticCoordinate & {
    R: number;
};
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/**
 *
 * getSolarEquatorialCoordinate()
 *
 * The equatorial coordinate of the Sun is the standard equatorial coordinate
 * of the Sun, as seen from the centre of the Earth, corrected for the equation
 * of center and the Sun's ecliptic longitude at perigee at the epoch.
 *
 * @param date - The date to calculate the Sun's equatorial coordinate for.
 * @returns The Sun's equatorial coordinate at the given date.
 *
 */
export declare const getSolarEquatorialCoordinate: (datetime: Date) => EquatorialCoordinate;
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/**
 *
 * getSolarAngularDiameter()
 *
 * The Sun's angular diameter is the distance between the Sun's centre and the Sun's limb.
 *
 * @param date - The date to calculate the Sun's angular diameter for.
 * @returns The Sun's angular diameter in degrees
 *
 */
export declare const getSolarAngularDiameter: (datetime: Date) => number;
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/**
 *
 * getSolarDistance()
 *
 * @param datetime - The date to calculate the distance to the Sun for.
 * @returns The distance to the Sun in metres forthe given date.
 */
export declare const getSolarDistance: (datetime: Date) => number;
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export declare const getHeliocentricJulianDate: (datetime: Date) => number;
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