/**
 * Karana — the half-tithi: each 6° of Moon−Sun elongation. Four fixed
 * karanas anchor the lunation (Kimstughna opens it, Shakuni/Chatushpada/
 * Naga close it); the seven movable ones cycle through the 56 slots
 * between.
 */
export interface Karana {
    /** Slot 0–59 across the lunation (0 = Kimstughna). */
    index: number;
    name: string;
}
/**
 * Karana at an instant, from apparent Sun/Moon longitudes in degrees.
 *
 * @example
 * ```ts
 * karana(145.28, 150.98); // { index: 0, name: 'Kimstughna' }
 * ```
 */
export declare function karana(sunLongitude: number, moonLongitude: number): Karana;
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