Acquiring signal…
On Wednesday 18 November at 10:16:07 UTC, Voyager 1 will be the first spacecraft one light-day from Earth: 25.9 billion kilometres, so far that its signal, at the speed of light, takes a full day to reach us. It left Cape Canaveral 49 years ago and is still talking.
Light covers 25.9 billion kilometres in a day. Voyager 1 is that far away.
A command sent from a Deep Space Network dish today reaches Voyager 1 tomorrow, and its answer arrives the day after. Everything we hear from it left the spacecraft a day ago. Nothing we've built has ever been this far from home.
Strictly, the milestone is the straight-line distance. Because Earth moves while the light is on its way, the first signal to spend a full 24 hours in flight reaches us about 16 hours later, early on 19 November UTC.
Earth's own orbit makes the distance rise and fall a little through the year, so the gap shrinks for a few months each spring. It never gets back inside a light-day: the closest Voyager 1 comes in 2027 is 24 h 01 m 28 s, around April 24.
The record's cover shows the Sun's place among fourteen pulsars, each line tagged with its pulse rate in binary, counted in ticks of the hydrogen atom. Turn it on in the map and it's drawn around the Sun, lined up with the real sky.
Ophiuchus
No telescope can see it, but you can point to it: RA 17h 15m, Dec +12° 04′. In November it's in the west after dusk, setting a few hours after the Sun from the United States.