/*****************************************************************************************************************/
/*****************************************************************************************************************/
import type { HorizontalCoordinate } from './common';
/*****************************************************************************************************************/
/**
 *
 * getAirmassPickering()
 *
 * Airmass is a measure of the amount of air along the line of sight when observing a star
 * or other celestial source from below Earth's atmosphere. It is formulated
 * as the integral of air density along the light ray.
 *
 * @see Pickering, K. A. (2002). "The Southern Limits of the Ancient Star Catalog" (PDF). DIO. 12 (1): 20-39.
 * @param target - The horizontal coordinate of the observed object.
 * @returns The airmass of the object.
 *
 */
export declare const getAirmassPickering: (target: HorizontalCoordinate) => number;
/*****************************************************************************************************************/