dhruve=on the polestar; tadgati=their movement; jnaanam=knowledge
By samyama on the pole star comes knowledge of the stars movements.
[By samyama] on the polestar comes knowledge of the movement of the stars.
(By performing Samyama) on the pole-star knowledge of their movements.
(By Practicing Samyama) On The Pole Star, Motion Of The Stars Is Known.