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import type { GeographicCoordinate } from './common';
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/**
 *
 * getGeneralizedSolarTransit()
 *
 * This is a lower accuracy method for calculating the transit of the Sun.
 *
 * Atmospheric conditions are not taken into account.
 *
 * @param datetime - The date to calculate the generalized solar transit for.
 * @param observer - The geographic coordinates of the observer.
 * @returns The generalized solar transit for the given date.
 *
 */
export declare const getGeneralizedSolarTransit: (datetime: Date, observer: GeographicCoordinate) => {
    sunrise: Date | null;
    noon: Date | null;
    sunset: Date | null;
    J: number;
    ha: number;
};
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export declare const getSolarTransit: (datetime: Date, observer: GeographicCoordinate, horizon?: number, temperature?: number, pressure?: number) => {
    sunrise: Date | null;
    noon: Date | null;
    sunset: Date | null;
};
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/**
 *
 * getNight()
 *
 * Calculates the start and end of the next night for the observer at the given date.
 *
 * @param date - The date to calculate the extent of the next night for.
 * @param observer - The geographic coordinates of the observer.
 * @param horizon - The horizon altitude to use for the calculation.
 * @param temperature - The temperature to use for the calculation.
 * @param pressure - The pressure to use for the calculation.
 * @returns The start and end of the next night for the observer.
 *
 */
export declare const getNight: (datetime: Date, observer: GeographicCoordinate, horizon?: number, temperature?: number, pressure?: number) => {
    start: Date | null;
    end: Date | null;
};
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export declare const isNight: (datetime: Date, observer: GeographicCoordinate, horizon?: number, temperature?: number, pressure?: number) => boolean;
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