Hold your hand up 12 inches from your face: you’re seeing your hand as it was a nanosecond ago. Everything you look at is, to one degree or another, in the past. The farther away in space, the more ancient in time.
— Katie Mack (@AstroKatie) November 25, 2018
Given the latency of the human nervous system and the variability thereof, you’re really seeing your hand as it was 10-30ms ago.