/**
 * @author @thkruz Theodore Kruczek
 * @description Orbital Object ToolKit (ootk) is a collection of tools for working
 * with satellites and other orbital objects.
 * @license AGPL-3.0-or-later
 * @copyright (c) 2025 Kruczek Labs LLC
 *
 * Many of the classes are based off of the work of @david-rc-dayton and his
 * Pious Squid library (https://github.com/david-rc-dayton/pious_squid) which
 * is licensed under the MIT license.
 *
 * Orbital Object ToolKit is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * Orbital Object ToolKit is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License along with
 * Orbital Object ToolKit. If not, see <http://www.gnu.org/licenses/>.
 */
import { Degrees, DegreesPerSecond, Kilometers, KilometersPerSecond, Radians, RadiansPerSecond } from '../main.js';
import { J2000 } from '../coordinate/J2000.js';
import { AngularDistanceMethod } from '../enums/AngularDistanceMethod.js';
import { Vector3D } from '../operations/Vector3D.js';
import { EpochUTC } from '../time/EpochUTC.js';
/**
 * Represents a topocentric right ascension and declination observation.
 *
 * Topocentric coordinates take into account the observer's exact location on the Earth's surface. This model is crucial
 * for precise measurements of local astronomical events and nearby celestial objects, where the observer's latitude,
 * longitude, and altitude can significantly affect the observed position due to parallax. Topocentric coordinates are
 * particularly important for observations of the Moon, planets, and artificial satellites.
 */
export declare class RadecTopocentric {
    epoch: EpochUTC;
    rightAscension: Radians;
    declination: Radians;
    range?: Kilometers | undefined;
    rightAscensionRate?: (RadiansPerSecond | null) | undefined;
    declinationRate?: (RadiansPerSecond | null) | undefined;
    rangeRate?: (KilometersPerSecond | null) | undefined;
    constructor(epoch: EpochUTC, rightAscension: Radians, declination: Radians, range?: Kilometers | undefined, rightAscensionRate?: (RadiansPerSecond | null) | undefined, declinationRate?: (RadiansPerSecond | null) | undefined, rangeRate?: (KilometersPerSecond | null) | undefined);
    /**
     * Create a new RadecTopocentric object, using degrees for the angular values.
     * @param epoch UTC epoch.
     * @param rightAscensionDegrees Right-ascension in degrees.
     * @param declinationDegrees Declination in degrees.
     * @param range Range in km.
     * @param rightAscensionRateDegrees Right-ascension rate in degrees per second.
     * @param declinationRateDegrees Declination rate in degrees per second.
     * @param rangeRate Range rate in km/s.
     * @returns A new RadecTopocentric object.
     */
    static fromDegrees(epoch: EpochUTC, rightAscensionDegrees: Degrees, declinationDegrees: Degrees, range?: Kilometers, rightAscensionRateDegrees?: DegreesPerSecond, declinationRateDegrees?: DegreesPerSecond, rangeRate?: KilometersPerSecond): RadecTopocentric;
    /**
     * Create a new RadecTopocentric object from a J2000 state vector.
     * @param state Inertial state vector.
     * @param site Site vector.
     * @returns A new RadecTopocentric object.
     */
    static fromStateVector(state: J2000, site: J2000): RadecTopocentric;
    /**
     * Gets the right ascension in degrees.
     * @returns The right ascension in degrees.
     */
    get rightAscensionDegrees(): Degrees;
    /**
     * Gets the declination in degrees.
     * @returns The declination in degrees.
     */
    get declinationDegrees(): Degrees;
    /**
     * Gets the right ascension rate in degrees per second.
     * @returns The right ascension rate in degrees per second, or null if it is not available.
     */
    get rightAscensionRateDegrees(): DegreesPerSecond | null;
    /**
     * Gets the rate of change of declination in degrees per second.
     * @returns The rate of change of declination in degrees per second, or null if the declination rate is not defined.
     */
    get declinationRateDegrees(): DegreesPerSecond | null;
    /**
     * Return the position relative to the observer site.
     *
     * An optional range value can be passed to override the value contained in this observation.
     * @param site Observer site.
     * @param range Range in km.
     * @returns A Vector3D object.
     */
    position(site: J2000, range?: Kilometers): Vector3D<Kilometers>;
    /**
     * Return the velocity relative to the observer site.
     *
     * An optional range and rangeRate value can be passed to override the values contained in this observation.
     * @param site Observer site.
     * @param range Range in km.
     * @param rangeRate Range rate in km/s.
     * @returns A Vector3D object.
     */
    velocity(site: J2000, range?: Kilometers, rangeRate?: KilometersPerSecond): Vector3D<KilometersPerSecond>;
    /**
     * Calculates the line of sight vector in the topocentric coordinate system.
     * The line of sight vector points from the observer's location towards the celestial object.
     * @returns The line of sight vector as a Vector3D object.
     */
    lineOfSight(): Vector3D;
    /**
     * Calculate the angular distance between this and another RadecTopocentric object.
     * @param radec - The other RadecTopocentric object.
     * @param method - The angular distance method to use.
     * @returns The angular distance.
     */
    angle(radec: RadecTopocentric, method?: AngularDistanceMethod): Radians;
    /**
     * Calculate the angular distance between this and another RadecTopocentric object.
     * @param radec - The other RadecTopocentric object.
     * @param method - The angular distance method to use.
     * @returns The angular distance
     */
    angleDegrees(radec: RadecTopocentric, method?: AngularDistanceMethod): Degrees;
}