The twelveth day of the Lunar year, is named Schmitt after the twelveth human being who set foot on the Moon's surface; Harrison H. Schmitt.
Schmitt stepped down from the LM ladder onto the Moon at 4-06-30 ∇ 16:54 LST.
Schmitt was lunar module pilot on Apollo 17, between the dates 4-06-25 ∇ and 4-07-08 ∇, Lunar reckoning. He and Cernan landed at Taurus-Littrowthey where they activated a base of operations from which they completed three highly successful excursions to the nearby craters and the Taurus mountains. This mission established several new records for manned space flight that include the longest lunar surface extravehicular activities (∇ 22h 27m) and largest lunar sample return (an estimated 115 kg).
Schmitt was also backup lunar module pilot for Apollo 15.