When does the last third of the night begin?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: What is the last third of the night, and when does it begin?

Answer:
The last third of the night is well known, because the night consists of three parts: the first third, the middle third, and the last third. You determine its beginning by dividing the night. The night varies in length and shortness depending on the seasons. The night is divided from the setting of the sun to the appearance of the dawn into three equal parts, each part being called a third: the middle third, the last third, and the first third. The most excellent of these is the middle third, which is the depth of the night, the depth of the night. Likewise, the last third is the time of the late night. We seek forgiveness in the late hours, and in the late hours they seek forgiveness. Therefore, one should pray in the middle third and the last third.
And whoever takes one-sixth from the middle third, taking one-sixth from the middle third and one-sixth from the last third, this constitutes the depth of the night and the end of the night, the depth of the night and the end of the night. He combines the two virtues: the depth of the night and the end of the night. This is the night prayer of Dawud (peace be upon him). Dawud (peace be upon him) would sleep for half the night, pray for one-third of it, and sleep for one-sixth of it. This is how Dawud would align with the depth of the night and the end of the night. He would take the last one-sixth of the middle third and the first one-sixth of the last third, and pray during this period, thereby combining the depth of the night with the end of the night. Yes.