present name originates with Michael van Langren, who labelled it Sinus Medius in his 1645 map. Johannes Hevelius called the feature Mare Adriaticum ("The Adriatic Sea") in his 1647 map. Giovanni Riccioli called it Sinus Aestuum ("Bay of Hot Days") in his 1651 map. Exploration The Surveyor 6 mission landed to the west-southwest of Bruce crater inside Sinus Medii in November 1967. Prior to that in July 1967, the Surveyor 4 had crashed nearby. References External links Sinus Medii at The Moon Wiki Medii, Sinus