Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: The end of Ramadan is marked by the key religious holiday of Eid al-Fitr, in which Muslim families worldwide gather for the "feast of breaking the fast". But for such a major global event, working out when it will happen is surprisingly complicated - as Ahmen Khawaja and Amir Rawash explain.

Eid: How is the start of the Muslim festival determined?