This is the 3438th most frequent Swedish word.
black
In Swedish, "black" means "ink."
In this sentence, 'svart' is used as an adjective to describe the state or color of the noun 'himlen' (sky) during nighttime conditions.
På natten är himlen alltid svart.
At night, the sky is always black.
Here, 'svart' is used as an adjective to describe the color of the noun 'katt' (cat).
Jag har en svart katt.
I have a black cat.
'Svart' functions as an adjective describing the color of the noun 'klänning' (dress).