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Questions tagged [sun]

Questions in regards to outdoor sunlight or solar related questions.

6
votes
1answer
188 views

Has extended exposure to sunlight and UV in the arctic or antarctic ever caused someone's eyes to change color?

In Biology SE I have just asked Could being exposed to excess UV in the arctic lead to a human eye color change? If so, what is the mechanism? but comments there questioned weather Arctic hiker Robert ...
7
votes
3answers
162 views

Is parasol a good gadget to stay cool walking around the city and parks?

I've only seen parasols being used in movies, cartoons and other artistic media, but extremely rarely in real life. Somehow it feels like I would look ridiculous with one in hand walking around the ...
6
votes
2answers
134 views

Approximating the time remaining before sun is set and it starts getting dark

Is there a definite way of approximating the time remaining before sun is set and it starts getting dark? I do understand that there is a time difference between 'Sunset' and the 'moment when it gets ...
2
votes
1answer
89 views

How to estimate the time between direct sunlight and sunrise?

Sometimes due to a high ridge or other land feature, the time that the sun comes over the horizon and gives direct sunlight is different from the time calculated by a sunrise table. From personal ...
1
vote
1answer
477 views

Can I use sunlight to purify water without a special container?

According to the answers at Does water in the sun get purified from or polluted by algae, fungi and bacteria? & Can sunlight be used to purify water? water in special containers can be purified in ...
6
votes
1answer
110 views

Where in nature can we find examples of natural “hoods” - either for reducing UV / sun exposure or for providing shelter from rain?

I'm in the process of designing a more functional "hood" to block UV / sun exposure and also provide shelter from rain. I believe that the best gear and products are developed by "looking to nature" ...
5
votes
5answers
2k views

Do some parts of the world really have 12 hours of daylight each day of the entire year?

I live about 45 degree north latitude. Other then at the Equinox, daylight is seldom 12 hours. Sometimes it is more sometimes less. The summer sun can last 16+ hours. I understand how and why there ...
2
votes
1answer
112 views

What situations/locations would be ideal for using a solar stove while backpacking?

After answering this question, I am wondering when it would be useful to cook with a solar stove. It certainly wouldn't make sense in an area that is constantly overcast or when speed is of the ...
6
votes
1answer
130 views

Are there any techniques to cooking food when camping in the wild by harnessing the energy of the sun?

Are there any techniques to cooking food camping in the wild by harnessing the sun's energy (rays)? We have all heard of solar panels being used to generate electricity, but are there any techniques ...
12
votes
5answers
2k views

Do I need a hard shell to ski in sunny weather conditions?

I'm going skiing for the first time. From what I've read, most everyone uses hard shell jackets and pants for skiing. However, they usually mention something about skiing in bad weather, frigid cold ...
9
votes
1answer
1k views

Does water in the sun get purified from or polluted by algae, fungi and bacteria?

We live at 27° latitude, about 200 metres above sea level and drink water from PET bottles laying around on the soil (SODIS method). They are filled with fresh water from a well and reused over and ...