Isnt speed of sight fastest?
imagine on sunny day
you are out
you keep hands on your eyes. now we turn
toward where sun is.
we remove our hand we see sun in no time
but suns light take 8 min to reach us.
which makes sun visible
now imagin you are near sun you can block sunlight by keeping enough big cloth in front of it
now you let the cloth fall
you see it falls in no time or just take 5 sec
now the person at earth will see that after 8 min he will see cloth falling
later than the first person
which means the second person is seeing past?
am i right
note: dont say cloth will burn you cant be that near to sun. there is no big enough cloth to cover sun.
tags physics astronomy speed of light
- ?Lv 77 years ago
When you remove your hand from your face you immediately see light that travels the thickness of your hand, but it's still light that left the sun 8 minutes and 20 seconds earlier. The sun doesn't stop shining just because you covered your eyes with your hand.
In your second scenario, both people are seeing the sun as it looked in the past. The first person sees the sun as it was 5 seconds earlier and the second person sees the sun as it was 8 minutes and 20 seconds earlier.
- poornakumar bLv 77 years ago
Sight is the same as the Light you receive in the eyes, from whatever source you set your eyes to 'see'.
speed of sight - speed of light
"we see sun in no time
but suns light take 8 min to reach us." : the light that reached your eyes started from the Sun 500 seconds ago (figure it out in minutes), not this instant.
Second para doesn't make "ANY" sense. Your logic is faulty. Every scene that reaches your eyes in as a picture (described by Photons of light) has spent some time traveling. If you look at a palm of your )outstretched hand it took a Nano second since the (reflected) light started from your palm (you have no capability to sense the time delay of 1 Nanosecond, that is all). Nothing is instantaneous, you fool.
Clear off all that $hit in your Cranium and think clearly.
- Irv SLv 77 years ago
What does covering your eye have to do with the Suns light?
That light was already on the way before you put your hand up wasn't it?
You seem to have a rather large sense of your own importance.
The Sun doesn't care whether you're watching or not.
- 7 years ago
*Everything* you see is in the past - even the tv you're watching in the corner... it takes light a small amount of time to travel across the room to your eye - so, you're seeing your tv show *as it was* a millionth of a second *ago*. And, the further away something is, the further back in time you see - the moon's image is as it was 1.3 seconds ago. Like you said, the sun's is from 8 1/3 minutes ago. Jupiter's is from about 1/2 hour ago. And, Sirius (to the left of Orion) we see it as it was 8.1 years ago - because light has a finite speed, and it takes time to cross any distance.
- What do you think of the answers? You can sign in to give your opinion on the answer.
- 7 years ago
Actually everything we see is the past. We see everything at least a fraction of second later than it happens.
The photon of light which the person on earth sees has taken 8 mins to move from the cloth to his eyes and hence he sees it late.
- 7 years ago
Yes you are approximately correct.
The second person sees the Sun 8 minutes later.
Just like stars like Rigel, for example, about 950 light years away - if it had blown up 500 years ago, then we wouldn't see the explosion for anther 450 years.
- 7 years ago
Nice attempt but NO. First of all if you blocked all light that emits from the sun, somehow you've traped the photons of light with just a cloth (which is no a good example). Now that you trapped all the light and you let the cloth drop, your not going to see anything, it would be 8 minutes of total darkeness, photons of light enter the visual cortex which plays the movie of life we see. Perception is what thats called.
- Erica sLv 77 years ago
You are right, but you are over complicating the situation. Because light travels at a finite speed, when it reaches your eyes (regardless whether you have them covered or not) it will have traveled a certain distance, therefore time has passed. We use the speed of light as a measuring stick, hence the well known expression "light year", that is, the distance light travels in one year.
- PaulLv 77 years ago
Yes. You see the light from the Sun as it was 8 and a half minutes in the past. You see the light from alpha centauri as it was four and a half years in the past and the light from Sirius 8 years in the past.
- KasseLv 47 years ago
Yes you are right. But what's up with that poem like formatting ?