There are three Mercury Retrograde periods each year, each lasting for about 3 weeks or so. In 2015 Mercury goes retrograde in the three periods of January-February, May-June and September-October. Of late Mercury retrograde is gaining much importance in our lives.n 2015 Mercury goes retrograde in the three periods of January-February, May-June and September-October.
Since aviation began, one fact has remained constant: Each president has flown more than his predecessor. Today, Air Force One has become an office in the sky where routine work is performed. It was not always so, especially in early years when many thought flying was dangerous. Theodore Roosevelt became the first president to fly in an aircraft, although it didnât happen during his years as president (1901-1909).
Following a successful glider test, the Wrights built and tested a full-size glider. 1  They selected Kitty Hawk, North Carolina as their test site because of its wind, sand, hilly terrain and remote location. 2  In fact, it was the first piloted glider. 3  This was the first successful, powered, piloted flight in history. In 1904, the first flight lasting more than five minutes took place on November 9. The Flyer II was flown by Wilbur Wright. In 1908, passenger flight took a turn for the worse when the first fatal air crash occurred on September 17.