import { Group, Vector3 } from 'thunder-3d';
/**
 * create sky system
 * @param date
 * @param latitude
 * @param longitude
 * @returns
 */
declare const createSkySystem: (date: Date, latitude: number, longitude: number, sunRadius?: number) => [(currentDate?: Date) => Vector3, Group & {
    sunPosition: Vector3;
}];
export default createSkySystem;