In-Universe:
The U.S.S. Defiant backs away from Deep Space Nine, comes about and spins over 200 degrees in preparation to leave the station.
Production:
The studio model is filmed spinning, and I believe they connected the motion control arm to the top of the ship and spun the motion control camera around it.
"The rolls and thrusters bursts Dax announced were brought to life by Gary Hutzel's crisp motion control photography of the Defiant and DS9."
— Cinefantastique Volume 29, Numbers 6/7 (Page 45)
