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The Solar Impulse aircraft known as HB-SIA is in the middle of its first 24-hour flight including a complete day/night cycle. The aircraft took off from its home airfield in Payerne, Switzerland shortly before 7 a.m. local time on Wednesday (1 a.m. EDT). It will spend the day climbing to an altitude to nearly 28,000 feet (8,500 meters) while charging its batteries.

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