#moon

• Adularia — A structural variety of orthoclase (potassium feldspar) presenting as transparent to translucent, colorless or whitish crystals, characterized by a specific silvery or opalescent schiller known as adularism. Named after the Adula Alps in Switzerland, where it was historically found within hydrothermal veins of metamorphic rocks. Due to its unique optical properties, fine specimens are cut as moonstones for gemology, while bulk materials are applied in high-grade ceramics and glass manufacturing.
• Aegaeon — An alternative name attributed in Greek mythology to the titan Briareus, a hundred-handed Hecatoncheire giant with fifty heads, celebrated for protecting Zeus's throne against the Olympian rebellion. In modern times, the term designates a small natural satellite of the planet Saturn (Saturn LIII), discovered in 2008 by the Cassini spacecraft and located within the planet's G ring.
• Aldrin — A surname of Germanic or Anglo-Saxon origin, famous due to the American astronaut Buzz Aldrin (b. 1930), the second man to walk on the Moon during the Apollo 11 mission. In the chemical industry and ecotoxicology, the lowercase term (aldrin) designates a highly toxic organochlorine insecticide, banned globally under the Stockholm Convention due to its heavy structural persistence in the environment.
• Alem — A traditional decorative element or metallic emblem, often in the shape of a crescent moon, globe, or spearhead, structurally mounted on top of flagpoles, military banners, or the domes and minarets of mosques in the Ottoman Empire. In historical Romanian documents, the term also referred to valuable ornaments received by rulers as a sign of investiture or recognition of authority by the Sublime Porte.
• Moon-land — To perform a controlled descent and landing maneuver of a spacecraft, module, or cosmic vehicle on the surface of the Moon. This high-precision technological and astronautical process involves slowing down the travel speed using retrorockets to guarantee a smooth contact with the lunar soil without damaging the equipment.
• Moon landing — The act of moon-landing and its result; the complete aerospace operation of descent, structural contact, and securing of a cosmic vehicle on the crust of the Moon. This engineering phenomenon represents one of the most complex phases of a lunar mission, requiring real-time dynamic velocity and altitude corrections.
• Amalthea — In Greek mythology, the nymph or goat that nursed the infant Zeus in a cave on Mount Ida; her horn became the cornucopia. In astronomy, it designates the third closest natural satellite of Jupiter, discovered in 1892, known for its highly irregular shape and deep red color.
• Apianus — The Latinized surname of the celebrated 16th-century German mathematician, astronomer, and cartographer, Petrus Apianus (Peter Bienewitz); renowned for his early works in cosmic geography and precise mapping of celestial bodies. His name was honorifically assigned to a major lunar impact crater located in the rugged highlands of the Moon's southern hemisphere.
• Apogee — The point in the elliptical orbit of the Moon or an artificial satellite that is farthest from the Earth; terrestrial apoapsis. Figuratively, the term denotes the highest point, climax, or maximum level of development, glory, power, or brilliance that a person, a civilization, a science, or a work of art can reach.
• Apollo — One of the most important deities in Greco-Roman mythology, the god of light, the sun, poetry, music, arts, and prophecy, son of Zeus and Leto; often depicted with a lyre or a bow. In the modern history of space exploration, the name designates NASA's legendary space program (Apollo Program) which achieved the first manned flights to the Moon between 1969 and 1972.
• Ariel — A proper name of Hebrew origin (meaning lion of God); in mythology and demonology, it represents a spirit of the air or water; in literature, it is the famous servant spirit from William Shakespeare's play The Tempest; in astronomy, it designates the fourth-largest moon of the planet Uranus, discovered in 1851 by William Lassell.
• Armstrong — A proper surname of Anglo-Saxon origin borne by prominent historical figures, most notably Neil Alden Armstrong (1930–2012), the American astronaut who became the first person to walk on the Moon during the Apollo 11 mission in July 1969. Etymologically, it literally translates to 'strong arm'.
• To moon-land — To perform a controlled descent and touchdown maneuver of a spacecraft, module, or vehicle onto the surface of the Moon. It represents the lunar equivalent of landing, requiring advanced retrorocket systems and structural guidance sensors to overcome the low gravitational pull of Earth's natural satellite.
• Moon-landable — Capable of undergoing a moon-landing process; a term used to describe a spacecraft structurally designed to withstand impact with the lunar ground or a topographic region that allows the safe execution of a descent maneuver.
• Moon landing — The act of landing on the Moon and its result; the dynamic and controlled process of descending, braking, and setting down a spacecraft or exploration module on the lunar surface. This high-precision technical procedure involves utilizing retrorockets to cancel orbital velocity and stabilize the vehicle under the reduced gravity of Earth's natural satellite.