/**
 * Julian Date and Sidereal Time calculations.
 * Based on Jean Meeus, "Astronomical Algorithms".
 */
/**
 * Convert a calendar date/time to Julian Date.
 * Standard Meeus algorithm (ch. 7).
 */
export declare function julianDate(date: Date): number;
/**
 * Greenwich Mean Sidereal Time in degrees (0-360).
 * Meeus ch. 12 formula.
 */
export declare function greenwichMeanSiderealTime(jd: number): number;
/**
 * Local Sidereal Time in degrees (0-360).
 * LST = GMST + longitude.
 */
export declare function localSiderealTime(date: Date, longitude: number): number;
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