/**
 * @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
 *
 * This class was ported from the python-sgp4 library by Brandon Rhodes. That library
 * is licensed under the MIT license and he maintains the copyright for that work.
 *
 * 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 { OmmParsedDataFormat } from '../interfaces/OmmFormat.js';
import { Sgp4OpsMode } from '../enums/Sgp4OpsMode.js';
import { GreenwichMeanSiderealTime, SatelliteRecord, StateVectorSgp4, Vec3Flat } from '../types/types.js';
export declare enum Sgp4GravConstants {
    wgs72old = "wgs72old",
    wgs72 = "wgs72",
    wgs84 = "wgs84"
}
export declare enum Sgp4Methods {
    NEAR_EARTH = "n",
    DEEP_SPACE = "d"
}
export declare class Sgp4 {
    private static angle_;
    private static asinh_;
    static createSatrec(tleLine1: string, tleLine2: string, whichconst?: Sgp4GravConstants, opsmode?: Sgp4OpsMode): SatelliteRecord;
    static createSatrecFromOmm(omm: OmmParsedDataFormat, whichconst?: Sgp4GravConstants, opsmode?: Sgp4OpsMode): SatelliteRecord;
    private static cross_;
    static days2mdhms(year: number, days: number): {
        mon: number;
        day: number;
        hr: number;
        min: number;
        sec: number;
    };
    private static dot_;
    static gstime(jdut1: number): GreenwichMeanSiderealTime;
    static invjday(jd: number, jdfrac: number): {
        year: number;
        mon: number;
        day: number;
        hr: number;
        min: number;
        sec: number;
    };
    static jday(year: number | Date, mon?: number, day?: number, hr?: number, min?: number, sec?: number, ms?: number): {
        jd: number;
        jdFrac: number;
    };
    private static mag_;
    private static newtonnu_;
    static propagate(satrec: SatelliteRecord, tsince: number): StateVectorSgp4;
    static rv2coe(r: Vec3Flat, v: Vec3Flat, mus: number): {
        p: number;
        a: number;
        ecc: number;
        incl: number;
        omega: number;
        argp: number;
        nu: number;
        m: number;
        arglat: number;
        truelon: number;
        lonper: number;
    };
    /**
     * Determines the sign of a given number.
     * @param x - The input number to evaluate.
     * @returns `-1.0` if the input number is less than `0.0`, otherwise `1.0`.
     */
    private static sgn_;
    /**
     * Computes the hyperbolic sine of a given number.
     *
     * The hyperbolic sine is calculated using the formula:
     * sinh(x) = (e^x - e^(-x)) / 2
     * @param x - The input number for which to calculate the hyperbolic sine.
     * @returns The hyperbolic sine of the input number.
     */
    private static sinh_;
    private static dpper_;
    private static dscom_;
    private static dsinit_;
    private static dspace_;
    private static getgravconst_;
    private static initl_;
    private static sgp4init_;
}