Transmissions are never “live”, if by “live” you mean instantaneous. There is always a delay due to the speed of light or even the speed of sound. The further away, the longer the delay. There is even a delay due to the processing electronics or even the hardware between your ears.
On the other hand, if you are getting the transmission from a source directly in the shortest possible time rather than from a stored version, perhaps that is “live”, even if the delay was years due to distance.
But if by “live” you mean in a manner that allows for interaction between the communicants, then that is an arbitrary definition determined mostly by the patience of the participants.
Glad to be of essentially no help whatsoever.
Actually ALL LIVE TV is in the past. There is always a small delay of a fraction of a second or more before you see it on your TV....
And even if it is only .2 second delay - it is still the past....by .2 seconds......the delay increases with distance as many here have clarified.......
As a science teacher in the 60’s, I’d point out to my students: “Look at the stars in the sky. What you see is not really there. You are seeing where the stars were ages ago.
Not only that. What you see now, as a whole, NEVER EXISTED AS YOU NOW SEE IT. Why? Because what you are seeing of one star came from a million years ago, while the light from the star that appears to be right next to it left 10 million years ago, and both have moved over that time. You are actually seeing a composite of what existed at different points in time, and never existed as you view it now.”