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import type { GeographicCoordinate, Interval } from './common';
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export declare enum Twilight {
    /**
     *
     * Night - The time when the sun is -18 degrees below the horizon.
     *
     */
    Night = "Night",
    /**
     *
     * Astronomical - The time when the sun is between -12 and -18 degrees below the horizon.
     *
     */
    Astronomical = "Astronomical",
    /**
     *
     * Nautical - The time when the sun is between -6 and -12 degrees below the horizon.
     *
     */
    Nautical = "Nautical",
    /**
     *
     * Civil - The time when the sun is between 0 and -6 degrees below the horizon.
     *
     */
    Civil = "Civil",
    /**
     *
     * Day - The time when the sun is above the horizon.
     *
     */
    Day = "Day"
}
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export type TwilightBand = {
    name: Twilight;
    interval: Interval;
};
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/**
 *
 * getTwilightBandsForDay()
 *
 * Returns the twilight bands for a given day, e.g., Night, Astronomical, Nautical, Civil, Day and their respective
 * intervals for a given observer (latitude and longitude) and datetime.
 *
 * @param datetime - The date and time for which to calculate the twilight bands
 * @param observer - The geographic coordinates of the observer
 * @param params - Optional parameters for the calculation
 * @returns An array of twilight bands for the given day
 */
export declare const getTwilightBandsForDay: (datetime: Date, observer: GeographicCoordinate, params?: {
    stepSeconds?: number;
}) => TwilightBand[];
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