import { Vec3 } from './quaternion.js';
import { default as ITRFCoord } from './itrfcoord.js';
export interface RiseSetType {
    rise: Date;
    set: Date;
}
/**
 *
 * Compute time of solar noon
 * https://gml.noaa.gov/grad/solcalc/solareqns.PDF
 *
 * @param thedate Date for which to compute local noon time
 * @param longitude Longitude for which to compute local noon, in degrees
 */
export declare function solarNoon(thedate: Date, longitude: number): Date;
/**
 *
 * Sun position in the Mean-of-Date frame
 * Vallado algorithm 29, page 279
 *
 * @param {Date} thedate Date for which position is computed
 * @returns Sun position in Earth-centered MOD frame, meters
 *
 */
export declare function posMOD(thedate: Date): Vec3;
/**
 *
 * @param thedate Date for which to compute sunrise & sunset
 * @param coord Ground location for which to compute
 * @param sigma Angle between noon and rise/set, in degrees:
 %                       rise/set: 90 deg, 50 arcmin
 *                       Civil twilight: 96 deg
 *                       Nautical twilight: 102 deg
 *                       Astronomical twilight: 108 deg
 *                       Default is for rise/set (90 + 50/60)
 *
 * @returns  { rise: Date Object of rise, set: Date object of set }
 */
export declare const riseSet: (thedate: Date, coord: ITRFCoord, sigma?: number | undefined) => RiseSetType;
//# sourceMappingURL=solar_calcs.d.ts.map