@peacegirl claims seeing instantly has nothing to do with distance or time. Really!
Yet she admits light travels about 186,000 miles per second. But she says we see in real time, with no delay.
So I ask again — she has never even tried to answer the question —
How did we measure the speed of light at all, if we see in real time? If we saw in real time, we’d have to conclude that the velocity of light was infinite!
Velocity is calculated as distance over time. Therefore to calculate any velocity there must be a delay from to source to reception.
Now consider Fred. Fred has a car. He has a destination in mind — a parking lot sixty miles due east.
Fred starts his car and travels due east. Fred’s car has something called a
speedometer — it tells him how fast he is traveling.
Let’s say Fred’s speedometer hangs steady at about 60. What does that mean? He is traveling 60 miles an hour!
See? Distance over time. Another way to put this is that he is traveling one mile per minute.
Of course this is an average, since Fred’s velocity is not inertial. There will be starts and stops, slowing down, speeding up, etc.
Fred gets to the parking lot in one hour. It’s the parking lot to a big-box store filled with useless crap that Fred intends to buy, but that is irrelevant to the issue it hand. (It just means that Fred is a big dummy.)
How should we analyze this situation according to peacegirl?
From point of view of the parking lot,
Fred was there instantly, even though it took him an hour to get there.
Right!