export type HighLatitudeRule = "NightMiddle" | "AngleBased" | "OneSeventh" | "None";
export interface PolarAdjustmentParams {
    latitude: number;
    angle: number;
    night: number;
    direction?: number;
}
export interface SeasonAdjustmentParams {
    latitude: number;
    dayOfYear: number;
    year: number;
    baseTime: Date;
}
export declare function requiresPolarAdjustment(latitude: number, threshold?: number): boolean;
export declare function adjustPrayerTime(time: number | Date, baseTime: Date, params: PolarAdjustmentParams, rule: HighLatitudeRule): Date | null;
export declare function seasonAdjustedMorningTwilight(params: SeasonAdjustmentParams): Date;
export declare function seasonAdjustedEveningTwilight(params: SeasonAdjustmentParams, shafaq?: "general" | "ahmer" | "abyad"): Date;
export declare function calculateNightLength(sunrise: Date, previousSunset: Date, nextSunrise?: Date): number;
export declare function getSafePrayerTimes(calculatedTimes: {
    fajr?: Date | null;
    sunrise: Date;
    sunset: Date;
    isha?: Date | null;
    maghrib?: Date | null;
}, coordinates: {
    latitude: number;
    longitude: number;
}, date: Date, angles: {
    fajr: number;
    isha?: number;
    maghrib?: number;
}, rule?: HighLatitudeRule): {
    fajr: Date;
    isha: Date;
    maghrib: Date;
};
export declare function isPolarDayNight(coordinates: {
    latitude: number;
    longitude: number;
}, date: Date): {
    isPolarDay: boolean;
    isPolarNight: boolean;
};
export declare function getRecommendedHighLatitudeRule(coordinates: {
    latitude: number;
    longitude: number;
}): HighLatitudeRule;
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