National Balloon Ascension Day is observed in the United States every January 9, commemorating the first manned balloon flight that took place on this day in 1793. This holiday celebrates the achievements in ballooning, particularly the flight by Jean-Pierre Blanchard, who launched his hydrogen gas balloon from Walnut Street Prison in Philadelphia and landed in Deptford, New Jersey, with notable witnesses including George Washington and future presidents. The day encourages individuals to learn about the history of ballooning, partake in tethered or untethered balloon rides, or attend hot air balloon festivals. Observers can also share their experiences on social media using the hashtags #NationalBalloonAscensionDay and #BalloonAscensionDay. The holiday has been recognized since at least 2011, highlighting the enduring fascination with ballooning and its historical significance.