What is meant by the Hour (Sā'ah), and how is the middle of the night, which marks the end of the 'Ishā' prayer time, calculated? And what are the times for the middle of the night, its first third, and its last third?

Scholars differed in defining the hour mentioned in the Hadith. The night begins from sunset and ends at dawn. To determine midnight, one calculates the time between sunset and dawn, and its midpoint is midnight. For example, if the sun sets at 6:00 PM and dawn breaks at 6:00 AM, then midnight is at 12:00 AM. In the same way, the thirds of the night can be determined.