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export type Maybe<T> = NonNullable<T> | undefined;
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export type Interval = {
    /**
     *
     * The from date of an interval is the start date of the interval.
     *
     */
    from: Date;
    /**
     *
     * The to date of an interval is the end date of the interval.
     *
     */
    to: Date;
};
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export type Observer = {
    /**
     *
     *
     * The datetime of an observer is the date and time at which the observation
     * was or will be made.
     *
     *
     */
    datetime: Date;
    /**
     *
     *
     * The elevation of an observer is the distance above sea level of the point
     * of observation, or the height of the point of observation above the
     * surface of the Earth (in SI metres).
     *
     *
     */
    elevation?: number;
} & GeographicCoordinate;
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export type CartesianCoordinate = {
    /**
     *
     *
     * The x-coordinate of a cartesian coordinate is the distance from the origin
     * to the point on the x-axis.
     *
     *
     */
    x: number;
    /**
     *
     *
     * The y-coordinate of a cartesian coordinate is the distance from the origin
     * to the point on the y-axis.
     *
     *
     */
    y: number;
    /**
     *
     *
     * The z-coordinate of a cartesian coordinate is the distance from the origin
     * to the point on the z-axis.
     *
     *
     */
    z?: number;
};
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export type EclipticCoordinate = {
    /**
     *
     *
     * The geocentric ecliptic longitude of a celestial object is the angular
     * distance measured eastward along the ecliptic from the March equinox to
     * the (hour circle of the) point above the Earth in question.
     *
     *
     */
    λ: number;
    /**
     *
     *
     * The geocentric ecliptic latitude of a celestial object is the angular
     * distance measured north or south of the ecliptic of the point on the
     * celestial sphere, relative to the ecliptic plane for an observer on
     * the Earth.
     *
     *
     */
    β: number;
};
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export type GalacticCoordinate = {
    /**
     *
     *
     * The galactic longitude of a celestial object is the angular distance
     * measured eastward along the galactic equator from the galactic center
     * to the (hour circle of the) point above the Earth in question.
     *
     *
     */
    l: number;
    /**
     *
     *
     * The galactic latitude of a celestial object is the angular distance
     * measured north or south of the galactic equator along the hour circle
     * passing through the point in question.
     *
     *
     */
    b: number;
};
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export type EquatorialCoordinate = {
    /**
     *
     *
     * The right ascension of a celestial object is the angular distance measured
     * eastward along the celestial equator from the Sun at the March equinox to
     * the (hour circle of the) point above the earth in question.
     *
     *
     */
    ra: number;
    /**
     *
     *
     * The declination of a celestial object is the angular distance measured
     * north or south of the celestial equator along the hour circle passing
     * through the point in question.
     *
     *
     */
    dec: number;
};
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export declare const isEquatorialCoordinate: (target: unknown) => target is EquatorialCoordinate;
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export type GeographicCoordinate = {
    /**
     *
     *
     * The latitude of a geographic coordinate is the angular distance north or
     * south of the equator of the point on the Earth's surface.
     *
     *
     */
    latitude: number;
    /**
     *
     *
     * The longitude of a geographic coordinate is the angular distance east or
     * west of the prime meridian of the point on the Earth's surface.
     *
     *
     */
    longitude: number;
};
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export type Hemisphere = 'Northern' | 'Southern';
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export type HorizontalCoordinate = {
    /**
     *
     *
     * The altitude of a celestial object is the angular distance of that object
     * above the observer's horizon. It is the complement of the zenith angle.
     * The horizon is 0° altitude, while directly overhead is 90° altitude.
     *
     *
     */
    alt: number;
    /**
     *
     *
     * The azimuth of a celestial object is the angular distance measured eastward
     * along the celestial horizon from the north point of the horizon to the (hour
     * circle of the) point above the earth in question.
     *
     *
     */
    az: number;
};
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export declare const isHorizontalCoordinate: (target: unknown) => target is HorizontalCoordinate;
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export type SphericalCoordinate = {
    /**
     *
     * The polar angle subtended by a point in spherical coordinates is the angle
     * measured from the positive z-axis to the line segment connecting the
     * origin to the point.
     *
     */
    θ: number;
    /**
     *
     * The azimuthal angle subtended by a point in spherical coordinates is the
     * angle measured from the positive x-axis to the line segment connecting
     * the origin to the point.
     *
     */
    φ: number;
};
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