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33 votes

In the northern hemisphere summer, why are places in the north cooler than those in the south?

The image below (apparently from "physicalgeography.net" is somewhat instructive: Notice that even in the middle of summer, India (at about 30 °N) still gets slightly more sun than the ...
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12 votes

In the northern hemisphere summer, why are places in the north cooler than those in the south?

Hours of sunlight are not the only factor that determines insolation (solar energy at the surface). Thought experiment: spread a bed sheet on the floor, switch the lights off, and shine a flashlight ...
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8 votes

Does the amount of UVA radiations one receives depend on the day ot the year?

UVA passes through the atmosphere without losing much intensity, so per quote one it's intensity doesn't change, nor does it's magnitude as a percentage of total insolation vary, much, during the year ...
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7 votes

What is this Sun and moon photographic anomaly?

Here my wife holds a globe with the moon in view. I carefully processed in a bit-mode to find the curve of light on the globe and drew perpendicular lines. Plainly we can see that the moon-lite side ...
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6 votes

Does the amount of UVA radiations one receives depend on the day ot the year?

Reddit user and r/EarthScience mod Halcyon3k pointed me to the following visualization that nicely illustrates Ash's great answer on the fact that "total ground level insolation intensity in $\...
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4 votes

What is this Sun and moon photographic anomaly?

You can see this effect on the powerline above the railroad tracks in the picture you posted too, it doesn't look straight, even though it likely was in reality! The straight line between the sun and ...
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  • 1,959
3 votes

What is this Sun and moon photographic anomaly?

When looking at the sky, spherical coordinates are used as a convenience. We turn our head and body in azimuth and altitude to compare the position of objects. In this regards, the sky looks like a ...
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  • 241
2 votes

Can clouds increase the level of UV-A radiations received on the earth surface? If so, by how much, and in which condition(s)?

I found one study from 2001 {1}: It was also determined that for a fulltime outdoor worker, the additional UVA exposure could approach approximately that of one third of a full ...
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2 votes

All longitudes experience the midday Sun. Why do all longituted experience the Midday sun?

Midday is when the sun is at the highest point in the sky for any given day. Some would sat directly overhead. The Earth is spheroidal in shape. As the Earth spins it presents a different line of ...
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2 votes
Accepted

In a picture taken in an unknown location, the sun shines on skyscrapers solely from the right. What direction was the camera facing?

Your son was assuming that it is morning and therefore the Sun is to the east. That assumption is not valid. The Sun also shines in the evening when the Sun is to the west. In order for the Sun to be ...
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  • 241
1 vote
Accepted

In a picture taken in Northern Hemisphere, the sun shines on skyscrapers solely from the right. What direction was the camera facing?

If the picture was taken in the early morning, with sun rising in the east the picture was taken from the south. If if was taken late in day, with the sun setting in the west, the picture was taken ...
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1 vote

What is this Sun and moon photographic anomaly?

Here is what you do. Look at the moon. See which way the sunlit face of the moon is pointing, not in a picture but in a real-life view of the moon. Using your own perception, trace a line ...
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  • 189

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