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Why is the sky red at night?
Posted 11 April 2009 - 10:16 AM
Or something to do with how high or low the sun is or refraction when light passes through the atmosphere.
So pollution Saturday, clean sky Sunday?
And how do you imagine this turns the sky red?
I'm not talking about sunset. I'm talking 3 AM, like right now. Some nights it's black.
Posted 11 April 2009 - 10:31 AM
This saying refers to the approach of either a low or high pressure system. A low pressure will always be to the east of us approaching up the Atlantic seaboard. That is why the morning sunrise in the eastern sky turns the sky red from the moisture approaching from the east. The red sky at night shows that the moisture is well to our west and that the low is tracking to our west
How did you miss the first paragraph? The moisture in the air changes how the light passes through the sky I guess.
Edited by Jankydank, 11 April 2009 - 10:32 AM.
Posted 11 April 2009 - 12:28 PM
For the same reason sunsets and sunrise are red. The suns light must travel through more atmosphere to reach the viewer, so more of the shorter wavelengths (the blues and greens) are absorbed by the atmosphere, and the longer ones (red) pass through.
Posted 12 April 2009 - 04:13 AM
Well, again, it depends upon the density of particles over the city, whether those be pollutants or moisture.
Yeah, but some nights it's not there. To me, it being there sometimes and not others is what is artificial about it.
If it is say a sunday to monday night with not much traffic, there won't be many exhaust fumes, will there? And if it is a dry night to boot, not much moisture particles either.
It do not matter what particles it is, as long as they are there in enough density to reflect the light given off from the city.
Around here, that means "low hanging clouds" on good nights, and traffic smog on non-windy bad nights, as my city is trapped by mountains on three sides, and ocean on another. Which essentially traps just about everything as a lid over our city center. As such, red-sky is more normal than not. Not to mention rain.
But the cool thing is looking at it from above, when one go up to one of the mountains surrounding the city, and look down
(When I say go, I really mean drive... I haven't got the stamina to trek up hills ffs )
Posted 19 April 2009 - 03:36 PM
Posted 10 December 2009 - 02:22 PM
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