/** 由地心黄经、黄纬与距离计算日月球面角距和月面照明比例。 */
export declare function calculateMoonGeometry(input: {
    sunLongitude: number;
    sunLatitude: number;
    sunDistance: number;
    moonLongitude: number;
    moonLatitude: number;
    moonDistance: number;
}): {
    elongationDegrees: number;
    illuminationFraction: number;
};