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import type { GeographicCoordinate } from './common';
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/**
 *
 * convertJulianDateToUTC()
 *
 * @param JD - the Julian Date to convert to UTC
 * @returns Date - the UTC date from the Julian Date
 *
 */
export declare const convertJulianDateToUTC: (JD: number) => Date;
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/**
 *
 * convertLocalSiderealTimeToGreenwhichSiderealTime()
 *
 * Makes the conversion from Greenwich Sidereal Time to Local Sidereal Time.
 *
 * @param LST - a given Local Sidereal Time
 * @param observer - The geographic coordinate of the observer.
 * @returns GST - the Greenwich Sidereal Time for the given Local Sidereal Times
 *
 */
export declare const convertLocalSiderealTimeToGreenwhichSiderealTime: (LST: number, observer: GeographicCoordinate) => number;
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/**
 *
 * convertGreenwhichSiderealTimeToUniversalTime()
 *
 * Makes the conversion from Greenwich Sidereal Time to Universal Coordinated Time.
 *
 * @param date - The datetime object to convert.
 * @param GST - The Greenwich Sidereal Time (GST) to convert.
 * @returns UTC - The Universal Coordinated Time (UTC) of the given date normalised to UTC.
 *
 */
export declare const convertGreenwhichSiderealTimeToUniversalTime: (GST: number, date: Date) => Date;
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