The 5 th Asian-Pacific Astronomy Olympiad (October 7-14, 2009) : . ... Only students did not participated at the IAO-2009 may participate in the APAO-2009 (that is a student may participate in the 14 th IAO or in the 5 th APAO but not in both of these Olympiads). ... For the students never participated in IAOs and APAOs before: Participants not older than 18.00 years on January 1, 2009 (i.e. born in 1991 or later). ... The dates of the V Asian-Pacific Astronomy Olympiad are October 7-14 , 2009. ...