Note
This is a verb indicating a position. (not a movement).It can be followed by a preposition and a dative
Usages of sitzen
Er sitzt an einem kleinen Tisch.
He sits at a little table.
Now he finished the process of sitting down, he is situated at the table. We are no longer talking about the direction of a movement but about the location, where the man is at.
an einem kleinen Tisch
is Dative
When we want to describe a location, we use prepositions followed by a dative.
in einem Café
an einem Tisch
Am Nachbartisch sitzt eine schöne Frau.
A beautiful woman is sitting at the neighbour table.
Am Nachbartisch sitzt eine Frau.
A woman is sitting at the neighbour table.
Am Fenster sitzt eine Fliege.
There is a fly at the window.
Did you notice: in German the fly sits at the window.
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