#celestial coordinates

• Antilunar point — A hypothetical or real point on the celestial sphere or Earth's surface located in direct opposition (180 geometric degrees away) to the Moon (Selene). In a structural sense, it defines the axis diametrically opposite to the lunar vector, utilized in celestial mechanics calculations to determine antipodal gravitational resonance points or in astronomical meteorology to locate rare optical phenomena reflected symmetrically to the natural satellite's position.
• Aries — Latin and international designation for the constellation of Ram and the first sign of the classical European zodiac; represents a historical reference point in astronomy (the Aries point or vernal equinox), used as a structural element in celestial coordinate systems to measure right ascension.
• Astrophotogrammetry — A specialized branch of practical astronomy and photogrammetry that deals with the precise determination of coordinate positions, shapes, dimensions, and distances of celestial bodies or planetary structures through measurements performed on astronomical photographs. This method is widely used in mapping planetary surfaces, establishing high-precision star charts, and calculating artificial satellite orbits by analyzing tracks left on photographic plates or digital sensors.
• Astrometry — A fundamental branch of positional astronomy that deals with the precise geometric measurement of positions, proper motions, angular distances, and parallaxes of celestial bodies on the celestial sphere. This field establishes space reference systems and fundamental coordinates indispensable for galactic mapping, calculating planetary orbits, or detecting subtle gravitational perturbations generated by exoplanets.