The International Year of Astronomy (IYA2009) was a year-long celebration of astronomy that took place in 2009 to coincide with the 400th anniversary of the first recorded astronomical observations with a telescope by Galileo Galilei and the publication of Johannes Kepler's "Astronomia nova", a book, published in 1609, that contains the results of the astronomer Johannes Kepler's ten-year-long investigation of the motion of what?
International Year of Astronomy The International Year of Astronomy (IYA2009) was a year-long celebration of astronomy that took place in 2009 to coincide with the 400th anniversary of the first recorded astronomical observations with a telescope by Galileo Galilei and the publication of Johannes Kepler's "Astronomia nova" in the 17th century. The Year was declared by the 62nd General Assembly of the United Nations. A global scheme, laid out by the International Astronomical Union (IAU), was also endorsed by UNESCO, the UN body responsible for educational, scientific, and cultural matters.
International Heliophysical Year The International Heliophysical Year is a UN-sponsored scientifically driven international program of scientific collaboration to understand external drivers of planetary environments and universal processes in solar-terrestrial-planetary-heliospheric physics. The IHY will focus on advancements in all aspects of the heliosphere and its interaction with the interstellar medium. This effort culminates in the "International Heliophysical Year" (IHY) in 2007-2008. The IHY concluded in February, 2009, but was largely continued via the International Space Weather Initiative (ISWI)