import type { SolarTimeResult } from "./types";
/**
 * Calculate local solar time using Spencer's Equation (±30s accuracy).
 *
 * @param isoDateTime - ISO 8601 string with timezone (e.g., "2025-11-01T09:00:00+09:00")
 * @param longitude - Longitude in degrees (-180 to 180, + = East, - = West)
 * @returns Solar time results with LST as ISO 8601 string preserving timezone
 */
export declare const getSolarTime: (isoDateTime: string, longitude: number) => SolarTimeResult;