/**
 * Lahiri (Chitrapaksha) ayanamsa — the rotating offset between the tropical
 * zodiac (equinox-anchored, what @grahan/core computes) and the sidereal
 * zodiac (star-anchored, what jyotish uses).
 *
 * Implemented as a cubic in julian centuries fitted to Swiss Ephemeris 2.10
 * `SIDM_LAHIRI` at 41 epochs spanning 1900–2100 (see fixtures/ayanamsa.json
 * and scripts/fit_ayanamsa.py); max fit residual 0.002″ inside that window.
 * Outside 1900–2100 the cubic extrapolates smoothly but is unverified.
 */
/**
 * Lahiri ayanamsa in degrees at a UT julian day.
 *
 * @example
 * ```ts
 * lahiriAyanamsa(2449217.71875); // 23.7681 (1993-08-18)
 * ```
 */
export declare function lahiriAyanamsa(jdUt: number): number;
/**
 * Convert a tropical ecliptic longitude to sidereal (Lahiri), degrees [0, 360).
 *
 * @example
 * ```ts
 * siderealLongitude(145.281, 2449217.71875); // ≈ 121.513 (Leo 1°30′)
 * ```
 */
export declare function siderealLongitude(tropicalLongitude: number, jdUt: number): number;
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