As soon as Leonov's radar and optical tracking confirmed that, the other ship injected itself into the same trajectory.

Somewhere within that magnificient disturbance, Frarsk vanished to optical tracking and radar search.

Since then radio astronomical quasar measurements have also measured Earth's rotation axis several orders of magnitude more accurately than optical tracking.

The system used various technologies including image stabilization, night vision, target designation with a laser, and optical tracking to stay with moving ground targets.

Early in the program, optical tracking (with a Baker-Nunn camera network and human spotters) was added.

Most trackballs now have direct optical tracking which follows dots on the ball.

But the main improvement is the optical tracking, which makes this mouse more resistant to peanut butter.

JPL requests you get optical tracking on the largest piece you can find.

When it was built it was believed by some in the west to be a military anti-satellite laser facility rather than one for optical tracking.

The spacecraft was painted to allow it to be used as a target for an optical tracking and observation experiment from the ground.