Answer: July 20
Notes: The United Nations General Assembly had officially declared International Moon Day to be marked every year on 20 July. It celebrates the day humans first walked on the moon in 1969. This was the day when Apollo 11 landed on the Moon, Earth’s only satellite on 20 July 1969. Lunar module pilot Edwin Aldrin followed Neil Armstrong 19 minutes later and they spent about two and a quarter hours outside the spacecraft while collecting 21.5 kg of lunar material.
