Perigalacticon, a term derived from astronomy, refers to the point in the orbit of a celestial body where it is closest to a galaxy. However, since this word may appear complex and unfamiliar to many, it's helpful to explore its synonyms. Firstly, 'perihelion' can be used when referring to the closest point of a planet's orbit around the Sun. In a similar context, 'perihelium' denotes the same phenomenon. For celestial bodies orbiting other stars, 'periastron' serves as an alternative term to describe their closest approach. By employing these synonyms, one can effectively express the idea of the point in an orbit where a celestial object comes closest to another celestial structure.