The AstroFlight Sunrise was an uncrewed experimental electric aircraft technology demonstrator and the first aircraft to fly on solar power. First conceived in November 1970, the Sunrise first flew on 4 November 1974 from Bicycle Lake, a dry lakebed on the Fort Irwin Military Reservation, California, United States. The first prototype was destroyed on its 28th flight by turbulence. The improved Sunrise II flew the following year.