/**
 * Contains vernal/autumnal equinox dates within a specified time range.
 */
export type EquinoxData = {
    /** Vernal (spring) equinox dates (northern hemisphere) in UTC */
    vernal: Date[];
    /** Autumnal (fall) equinox dates (northern hemisphere) in UTC */
    autumnal: Date[];
};
/**
 * Finds all equinox events (vernal and autumnal) occurring within the given date range.
 * The algorithm uses an approximate guess per year then refines the guess via Newton’s method.
 *
 * The returned object contains arrays of Date objects for the vernal and autumnal equinoxes.
 *
 * @param rangeStart - Starting Date of the search range.
 * @param rangeEnd - Ending Date of the search range.
 * @returns Object with keys 'vernal' and 'autumnal', each an array of Date instances.
 */
export declare function getEquinoxes(rangeStart: Date, rangeEnd: Date): EquinoxData;
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