(UPU/1969/Res.C.11)
World Post Day is an international day that occurs each year on October 9, the anniversary of the Universal Postal Union (UPU),[1] which started in 1874 in Switzerland. The UPU was the start of the global communications revolution, introducing the ability to write letters to others all over the world. World Post Day started in 1969. Since then, countries all over the world take part in celebrations to highlight the importance of the postal service. Many things happen on this day. Post offices in some countries hold special stamp collection exhibitions; there are open days at postal measures and there are workshops on postal history. The UPU organizes an international letter writing competition for young people. Since 1969, UPU announces the annual best postal services of the year on the 9 October.[1]
Postal systems have been in operation for many centuries. From way back in history, people sent letters to each other. These were delivered on foot or on horseback by special messengers. From the 1600s the first national postage systems began springing up in many countries. These were more organized and many people could use them. Slowly countries agreed to exchange mail internationally. By the late 1800s there was a global postal service, but it was slow and complicated. The birth of the UPU in 1874 opened the way for the efficient postal service in existence today. In 1948, the UPU become an agency of the United Nations.

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(A/RES/54/68)
By resolution 54/68 of 6 December 1999, the General Assembly proclaimed World Space Week, to celebrate the contributions of space science and technology to the betterment of the human condition.
World Space Week is the largest annual space event in the world. The weeks helps build up the workforce of tomorrow by inspiring students; demonstrates visible public support for the space programme; educates the public about space activities; and fosters international cooperation in space outreach and education.
Each year a theme is selected by the World Space Week Association Board of Directors in close coordination with the UN Office of Outer Space Affairs. The theme provides broad guidance to World Space Week participants on the content of their programmes. The theme is selected to increase the impact of World Space Week on all humanity further, by using a uniform theme globally.
Space and Sustainability
The World Space Week 2022 theme is “Space and Sustainability” focusing on achieving sustainability in space and achieving sustainability from space. The theme is inspired by how sustainability in space relates to how humanity uses space, most pressingly, the orbital area surrounding Earth.
Space exploration and remote Earth observation can help drive change for our home planet. This includes measuring climate change, identifying pollution on land and at sea, and supporting agriculture in developing nations.
Of the 169 targets that form the 17 Sustainable Development Goals, 65 directly benefit through Earth observation satellites and related technologies. Achieving the SDGs would be so much harder without the tools and techniques available to scientists through space exploration.

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