The Global Positioning System GPS, while originally a military project, has significant applications for the civilian industry. Civilian applications benefit from GPS signals by utilizing one or more of three basic components of the GPS location, relative movement, and time. Muslims around the world perform five prayers a day. The five prayers are based on astronomical position of the sun. Many systems have been developed to serve as prayer time providers but none of these systems provide the time for users that are traveling onboard an aircraft from one country to another, where (depending on the speed and directions of the aircraft) prayer time can change significantly.
"Using GPS to Provide Prayer Times onboard an Airplane while in Motion,"
Journal of International Technology and Information Management: Vol. 18
, Article 11.
Available at: http://scholarworks.lib.csusb.edu/jitim/vol18/iss3/11