Linked Questions

9
votes
2answers
12k views

Why does the Sun “shine brighter” some days? [duplicate]

Today, the Sun seems extremely bright; more dazzling than usual, and even the roads seem to be brighter so it's not just when you look up in the sky. Is more light actually getting through (perhaps ...
19
votes
1answer
3k views

Why does the sun “beat down” harder in the summer - or does it?

I know that seasons are caused by the Earth's axial tilt - in summer, latitudes away from the equator receive more surface irradiance (power per unit area), and vice versa in the winter, because of ...
4
votes
4answers
25k views

How much lux does the Sun emit?

I want to know how much lux the sun emits on a bright day - I don't mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the ...
6
votes
2answers
3k views

Why does atmospheric water vapor need dust particles to fall as rain?

I appreciate that rain can fall due to the process of coalescence described below, but I was under the impression that nucleation based around atmospheric dust particles was a vital part of the ...
2
votes
1answer
2k views

Why does the sun/moon appear red when there are fires?

Recently, in the United States, the moon and sun have become very deep red when they are near the horizon. The reason given for this is that there have been extensive wild fires in the Northwest. So, ...
4
votes
1answer
315 views

Color of sun during sunset on moon

I just learned that sunset on earth is orange because of the Rayleigh Scattering effect. The dust particles in the atmosphere scatters the sunlight during the sunset. However, since the moon has no ...
3
votes
2answers
298 views

Function to fit solar radiation data

I have ground-level radiation data of solar incoming radiation from a radiometer (cosine collector) measured along the day. In the following plot you can see PAR irradiance (ie visible light) in Watts ...
1
vote
1answer
330 views

How much air would be needed to block sunlight?

Was watching a sunset on the sea, I was wondering what would be a lower bound for the thickness of air needed to almost completely obscure the reddish light of the sun, or at least to make it ...
1
vote
0answers
136 views

How does the sun rise upwards with brightening and set downwards with low fading being stationary on a spinning earth? [closed]

Can someone please apprise me with this phenomena that earth is spinning on it's own axis with 23.5 degrees tilt also rotating around the sun while sun is stationary. when sun is just rising up we can ...
0
votes
1answer
54 views

What causes the perceived intensity of the sun to change on a short timescale?

I was inspired by this question to ask, what causes the "beating down" feeling of the sun to vary day to day? While the linked post explains why the sun feels hotter in the summer than in the winter, ...