Mercury by average. I've wondered in the past it we could land people on Mercury... at the right distance from the sunset terminator where the surroundings had

Mercury by average. I've wondered in the past it we could land people on Mercury... at the right distance from the sunset terminator where the surroundings had cooled to, say 21 degrees C, (70F). With a 1408 (Earth) hour day, the landing party could stay for quite a while before needing to relocate again towards the terminator, or leave.