The International Astronomical Olympiad (IAO) is a nine-day event that usually takes place between 23 September and 22 November. The XII. IAO in 2007 brought a Czech team a silver medal, and the 2008 event, XIII. IAO, saw Czechs win two bronze medals. The 2009 International Astronomy Olympiad ended with Czechs winning two silver (senior group competitors) and three bronze (junior group competitors) medals.
