Sea of Tranquility

== English == === Alternative forms === Sea of Tranquillity === Etymology === Calque of Latin Mare Tranquilitātis (spelled with one L), from Latin mare (“sea”)+tranquilitātis (“tranquility”). Coined by Italian Jesuit astronomer Giovanni Battista Riccioli, by labelling a map created by Italian Jesuit optician Francesco Maria Grimaldi, and then published in 1651 in the Almagestum Novum. === Proper noun === the Sea of Tranquility (planetology) A basin in Nearside, Moon, Earth, Solar System; location of the first manned moon landing, in 1969. ==== Synonyms ==== Mare Tranquillitatis ==== Derived terms ==== ==== Translations ==== === References ===