/**
 * Tithi — the lunar day: each 12° of Moon−Sun elongation is one tithi,
 * 30 per lunation (15 waxing, 15 waning). Ayanamsa cancels in the
 * difference, so tropical longitudes are fine.
 */
export interface Tithi {
    /** 0–29 across the lunation (0 = Shukla Pratipada, 29 = Amavasya). */
    index: number;
    /** Waxing (shukla) or waning (krishna) fortnight. */
    paksha: 'shukla' | 'krishna';
    /** Name within the paksha, e.g. "Pratipada", "Purnima", "Amavasya". */
    name: string;
}
/**
 * Tithi at an instant, from apparent Sun/Moon longitudes in degrees.
 *
 * @example
 * ```ts
 * tithi(145.28, 150.98); // { index: 0, paksha: 'shukla', name: 'Pratipada' }
 * ```
 */
export declare function tithi(sunLongitude: number, moonLongitude: number): Tithi;
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