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import type { EquatorialCoordinate, Observer } from './common';
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/**
 *
 *
 * @class new Observation()
 *
 * @description A class to represent an observation of an astronomical target { ra, dec } at a specific
 * location (geographic longitude, latitude and elevation above sea level) and datetime (in Universal
 * Coordinated Time, UTC) on Earth.
 *
 *
 */
export declare class Observation extends Object {
    target: EquatorialCoordinate;
    ra: number;
    dec: number;
    az: number;
    alt: number;
    ha: number;
    datetime: Date;
    longitude: number;
    latitude: number;
    constructor({ ra, dec }: EquatorialCoordinate, observer?: Observer);
    at({ datetime }: {
        datetime: Date;
    }): void;
    setDatetime(datetime: Date): void;
    private setEquatorialCoordinates;
    private setHourAngle;
    private setHorizontalCoordinates;
    private setLongitude;
    private setLatitude;
}
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