The daily timing is according to the movement of the sun, and the monthly timing is according to the movement of the moon. Therefore, every twelve lunar cycles represent a year. As Allah (swt) told us that:
﴾ شَهْرُ رَمَضَانَ الَّذِي أُنزِلَ فِيهِ الْقُرْآنُ﴿
(The month of Ramadhan [is that] in which was revealed the Qur’an,) (Al-Baqara: 185)
So, He (swt) determined the position of this night in the month of Ramadan. Since thousand months contain eighty-three months of Ramadan, thus, the meaning is: The night of Al-Qadr is better than thousand months which do not have the night of Al-Qadr, this is a clear matter.