Senses incoming ships

We’ll have a connection in moments, Lord Vader,” the captain of the Royal Guard said.

“Use the Emperor’s personal frequency. Arrange for immediate—”

Vader sensed it before he could see it. He looked sharply at his Master, saw him staring up at the sky, at two rapidly approaching lights descending from altitude—ships, Vader knew. Perhaps they’d seen the fire.

- Lords of the Sith, Chapter Twelve, Page 263