Okay okay no joke?

Question

I know that there is speed to light :

What is the speed to dark?

Answer 1

the same

Answer 2

there is no 'speed of dark'

Light moves. Darkness is the absence of light and does not.

An analogy may help:

Heat moves, cold is the absence of heat. You can describe the rate at which you “cool” and infer a “speed of cold” from that. However the physical reality is that only heat moves.

Similarly you might infer a “speed of darkness” measuring the rate at which darkness envelopes a room when the light is switched off (for example). But be aware that you are actually “measuring” a function of the speed of light – in the room case it is the speed at which the light leaves the room (ie c for speed of light over n refractive index of room accounting for light exit paths, absorption and reflection at boundaries, etc).

Answer 3

Light represents a movement of particles (fotons).

It's a bit harder to define dark... if you mean no light, so no fotons moving there, well, they move out with the speed of light.

If you mean how long it takes before you see no more light, that it will take longer because your brain need to process the signals from your eyes.

Answer 4

assuming the earth's frame of reference:

darkness on earth moves roughly at the speed of 1037.5 mph

think about the earth rotating around the sun, night time comes around every 24 hours, so darkness keeps moving, and at the speed of 1037.5 mph

earth's circumference is 24900 miles

1 earth rotation = 24 hours

distance / time = speed

24900 / 24 = 1037.5 mph