In contrast, in the horizontal coordinate system, a star's position differs from observer to observer based on their positions on the Earth's surface, and is continuously changing with the Earth's rotation. The coronal plane or frontal plane divides the body into dorsal and ventral portions. [6] [9] [10]. Note that there is no "mean ecliptic", as the ecliptic is not subject to small periodic oscillations. In human and animal anatomy, three principal planes are used: The sagittal plane or lateral plane is a plane parallel to the sagittal suture. One sidereal hour (approximately 0.9973 solar hours) later, Earth's rotation will carry the star to the west of the meridian, and its hour angle will be 1h. In other words, it is the moment at which the center of the visible Sun is directly above the equator. [5]. Un système de référence en anatomie, désigne la terminologie utilisée pour se repérer de façon précise dans la structure anatomique d'un organisme, humain ou non. Declination's angle is measured north or south of the celestial equator, along the hour circle passing through the point in question. “Equatorial plane.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/equatorial%20plane. The hour angle of a point is the angle between two planes: one containing Earth's axis and the zenith, and the other containing Earth's axis and the given point. The orbital plane of a revolving body is the geometric plane in which its orbit lies. Superimposed on this is a smaller motion of the ecliptic, and a small oscillation of the Earth's axis, nutation. All have: The reference frames do not rotate with the Earth (in contrast to Earth-centred, Earth-fixed frames), remaining always directed toward the equinox, and drifting over time with the motions of precession and nutation.


The system's origin can be the center of either the Sun or Earth, its primary direction is towards the vernal (March) equinox, and it has a right-hand convention. At the poles, the celestial equator coincides with the astronomical horizon. Latitude is used together with longitude to specify the precise location of features on the surface of the Earth. The distance from a given point of interest to the center of Earth is called the geocentric radius or geocentric distance. For example, the north celestial pole has a declination of +90°. The coronal plane is a plane that separates the body into anterior and posterior parts On its own, the term latitude should be taken to be the geodetic latitude as defined below.
In contrast to the common usage of spring and autumn (fall), or vernal and autumnal, equinoxes, the celestial coordinate system equinox is a direction in space rather than a moment in time. In particular, it can refer to the gradual shift in the orientation of Earth's axis of rotation in a cycle of approximately 25,772 years. Although there are two intersections of the ecliptic with the celestial equator, by convention the equinox associated with the sun's ascending node is used as the origin of celestial coordinate systems and referred to simply as the equinox. The celestial equator is defined to be infinitely distant (since it is on the celestial sphere); thus, the ends of the semicircle always intersect the horizon due east and due west, regardless of the observer's position on Earth. In other words, the celestial equator is an abstract projection of the terrestrial equator into outer space.

In astronomy, a celestial coordinate system is a system for specifying positions of satellites, planets, stars, galaxies, and other celestial objects.

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