/**
 * One meteor shower of the working list.
 *
 * @example
 * ```ts
 * import { METEOR_SHOWERS, type MeteorShower } from "@johnmorrisdotca/chikyu-earth/meteors";
 *
 * const perseids: MeteorShower | undefined = METEOR_SHOWERS.find((shower) => shower.code === "PER");
 * console.log(perseids?.name, perseids?.zhr, perseids?.parent);
 * ```
 */
export interface MeteorShower {
    /** The IAU's three-letter code: `PER` for the Perseids. */
    code: string;
    /** The IAU's number for the shower. */
    iau: number;
    name: string;
    /** The name used in Japan. */
    nameJa: string;
    /** The first day of activity, as month (1 to 12) and day. A shower may run over the new year. */
    start: readonly [month: number, day: number];
    /** The last day of activity. */
    end: readonly [month: number, day: number];
    /** The day of the maximum in 2026; in other years it can fall a day either side. `peakSolarLongitude` is the lasting figure. */
    peak: readonly [month: number, day: number];
    /** The Sun's longitude at the maximum, in degrees, for the equinox of 2000.0: where the Earth is on its orbit, whatever the calendar says. */
    peakSolarLongitude: number;
    /** The radiant at the maximum: right ascension and declination, in degrees. */
    radiant: {
        ra: number;
        dec: number;
    };
    /** The speed the meteors meet the atmosphere at, in kilometres a second: 11 is very slow, 72 very fast. */
    speedKmS: number;
    /** The population index r: 2.0 to 2.5 has more bright meteors than average, above 3.0 more faint ones. */
    populationIndex: number;
    /** The zenithal hourly rate at the maximum: what an ideal watcher would count in an hour under a perfect sky with the radiant overhead. `null` where the list says the rate varies from year to year. */
    zhr: number | null;
    /** The comet or asteroid whose dust it is, where a source used here names one. */
    parent?: string;
}
/**
 * The working list, in the order of the year.
 *
 * @example
 * ```ts
 * import { METEOR_SHOWERS } from "@johnmorrisdotca/chikyu-earth/meteors";
 *
 * const strongest = [...METEOR_SHOWERS].sort((a, b) => (b.zhr ?? 0) - (a.zhr ?? 0))[0];
 * console.log(METEOR_SHOWERS.length, strongest?.name); // 37 "Geminids"
 * ```
 */
export declare const METEOR_SHOWERS: readonly MeteorShower[];