﴿ وَجُمِعَ ٱلشَّمْسُ وَٱلْقَمَرُ ﴾

“and the sun and the moon are brought together”

and the sun and the moon are brought together so that both of them will rise from the west; or it means when the light of both of them disappears — and this will be on the Day of Resurrection —