Summary: | This work will focus on how the JEM-EUSO project, which orbits around Earth on the International Space Station and whose purpose is to detect air shower from the atmosphere caused by high energy particles from outer space, will be able to determine its positon once it detects such air shower. This is best done by adding a star tracker to it. The main purpose is to determine how accurate the star tracker has to be. To do this a few calculations were made, as well as looking for any star trackers that may fulfill the requirements. The report will start with an introduction that consists of the air shower phenomenon itself, followed by the objective, the calculations and the results of the calculations. This is then followed by a small discussion and a conclusion.
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