Sunset and sunrise time calculator

We want to develop a desktop application which calculates the time of sunrise and sunset in specified locations. The deadline is 5th May 2010. The program should do the following: 1)Calculate sunrise and sunset time using country and city, longitude and latitude and date as inputs. If nothing is input from the user, the application should default the required values from the system date and the regional settings of the pc. 2)Popular locations are required to be available in the selection of the location in Country, city format. These should be the capital cities countries? of Europe.? If possible, please add the capital cities of the most popular countries of USA, Africa and Asia. 3)The application must be able to save custom user locations when user inputs longtitude and latitude and save it with a user desired name. 4)Output should be a screen with the format: City, Country, sunrise time: hh:mm, sunset time: hh:mm and have the rest of the save and selection controls. 5)If possible, user should be able to select a picture as a background image. 6)Deliverables: Bug-free compiled application, source code, simple? user manual (non-technical) 7)Executable in Windows 2000/XP, Vista, 7 all versions. Preferred programming languages: Java, VB.NET but it is acceptable? by using? other programing languages.