The story
- Latin · calque ofMare Tranquilitātis
- English todaySea of Tranquility
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.
Etymology from Wiktionary, CC BY-SA 4.0.