The landing in Nagoya, on Japan's main island, concluded what had been the aircraft's longest non-stop period of flight.
But it nevertheless cut short what was due to have been a marathon trip across the Pacific Ocean, the longest single leg of an effort to raise awareness of green energy by circumnavigating the globe powered only by the sun.
"#Si2 is now parked in Nagoya. What a flight! Looking forward to continuing this adventure with @bertrandpiccard," pilot Andre Borschberg tweeted early today, referring to the mission initiator and fellow pilot Bertrand Piccard.
The main support crew was expected to fly in from Nanjing, China, later today, bringing, amongst other things, a huge inflatable hangar that needs to be assembled in sections to cover the plane, including its 72-metre (236-foot) wings.
Solar Impulse 2 was trying to fly continuously from Nanjing to Hawaii, and planners had expected the 8,500 kilometres (5,250 miles) to take six days and six nights of non-stop flight, with onboard batteries charging up during the day.
At an impromptu press conference around an hour after he touched down, Borschberg told reporters that the diversion was no problem for the success of the mission.
"I would say it has no impact," he said, adding it was a "great pleasure" to be in Japan, a place he lived 30 years earlier.
Curious locals gathered in a park near the airport today, hoping to get a glimpse of the record-breaking plane, which has 17,000 solar cells and weighs just 2,300 kilograms.
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