The correct answer is: A. International Year of Astronomy
The United Nations declared 2009 as the International Year of Astronomy (IYA2009) to celebrate the 400th anniversary of the first use of a telescope by Galileo Galilei. The IYA2009 was a worldwide initiative that aimed to promote astronomy and its importance to society. It was a year-long celebration of astronomy that included events and activities for people of all ages and backgrounds.
The IYA2009 was a success, with over 100 million people participating in events and activities around the world. It helped to raise awareness of astronomy and its importance to society, and it inspired a new generation of astronomers.
The IYA2009 was also a significant event in the history of astronomy. It was the first time that the United Nations had declared a year dedicated to astronomy, and it helped to promote astronomy as a global science.
The IYA2009 was a major success, and it helped to inspire a new generation of astronomers. It also helped to promote astronomy as a global science.
The other options are incorrect.
- Option B: The United Nations did not declare 2009 as the International Year of Natural Fibres.
- Option C: The United Nations did not declare 2009 as the International Year of Reconciliation.