This is the 75th most frequent Danish word.
ned
"Down."
In this context, 'ned' signifies the downward motion or direction of the action, i.e., descending.
Jeg går ned ad trappen.
I am walking down the stairs.
Here, 'ned' is used metaphorically to indicate the act of recording something in writing onto a surface.
Han skrev det ned på papiret.
He wrote it down on the paper.
In this expression, 'ned' indicates the movement of the sun descending below the horizon line.