/**
 * Converts degrees to radians.
 * Commonly used in trigonometric calculations involving angles.
 *
 * @param deg Angle in degrees
 * @returns Angle in radians
 */
export declare function deg2rad(deg: number): number;
/**
* Returns the sol of the year (day number in the current Martian year) from Mars Sol Date (MSD).
* @param msd Mars Sol Date
* @returns Sol of the year (1–669)
*/
export declare function getSolOfYear(msd: number): number;