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).
The first airplane to take flight was built by the Wright brothers  in Ohio USA and was transported first to North Carolina and flown  for its first time there.  The brothers Orville and Wilbur Wright were two Americans who are  gener â¦ ally credited with inventing and building the world's first  successful airplane and making the first controlled, powered and  sustained heavier-than-air human flight, on 17 December  1903 in Kitty Hawk, NC on December 17, 1903.