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Q&A

Posts tagged sun

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Q&A At what angle do you hold out your arm at 10 and 15 degrees? [duplicate]

Can you pls elaborate on the 10 degrees and 15 degrees? I don't know geometry or math. How exactly do you hold out your arm against the sun? At what angle to the sun? Illustrations appreciated plea...

1 answer  ·  posted 1y ago by TextKit‭  ·  closed as duplicate 1y ago by Charlie Brumbaugh‭

Question sun
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Q&A What is the difference between SPF and UPF, if any?

I read on https://en.wikipedia.org/w/index.php?title=Sun_protective_clothing&amp;oldid=930941768: A relatively new rating designation for sun protective textiles and clothing is UPF (Ultraviole...

1 answer  ·  posted 3y ago by Franck Dernoncourt‭  ·  last activity 3y ago by System‭

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Q&A Would Mud Prevent Sunburn?

If you had no sunburn cream, would it work to cover your exposed skin in mud and gunk as a crude way to prevent sunburn? I have never tried it. I have tried using paper tissues on my face as a sun ...

2 answers  ·  posted 3y ago by Snack_Food_Termite‭  ·  last activity 3y ago by System‭

Question sun
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Q&A How to tell whether a particular pair of sunglasses will effectively protect your eyes?

This detailed paper https://www.aoa.org/Documents/CRG/Blue%20Light%20and%20Eye%20Damage.pdf from the American Optometric Association details the various types of short term (i.e. snow blindness) an...

2 answers  ·  posted 3y ago by mmcc‭  ·  last activity 3y ago by System‭

Question safety sun sunglasses
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Q&A What to look for in eco-friendly sunblock?

With sunblock it's relatively easy to know what to look for in terms of SPF, UV types etc, however with eco-friendly ones that aim to not put chemicals back in the ocean (used by surfers, swimmers,...

2 answers  ·  posted 3y ago by Aravona‭  ·  last activity 3y ago by System‭

Question sun uv-protection
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Q&A How to detect significant sun damage in a plastic molded kayak?

Molded kayaks are usually made of polyethylene, an otherwise extremely durable material which can be damaged by the sun. The used market is full of kayaks manufactured ten or twenty years ago whic...

1 answer  ·  posted 3y ago by mmcc‭  ·  last activity 3y ago by System‭

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Q&A 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 Rob...

1 answer  ·  posted 4y ago by uhoh‭  ·  last activity 4y ago by System‭

Question snow sun sunglasses
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Q&A 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...

3 answers  ·  posted 4y ago by user1306322‭  ·  last activity 4y ago by System‭

Question sun
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Q&A 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 col...

5 answers  ·  posted 6y ago by Chris Mendez‭  ·  last activity 5y ago by System‭

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Q&A 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 g...

2 answers  ·  posted 5y ago by WedaPashi‭  ·  last activity 5y ago by System‭

Question sun time
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Q&A 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 answer  ·  posted 5y ago by Charlie Brumbaugh‭  ·  last activity 5y ago by System‭

Question sun sunrise
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Q&A 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? &amp; Can sunlight be used to purify water? water in special containers can be purified...

1 answer  ·  posted 5y ago by James Jenkins‭  ·  last activity 5y ago by System‭

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Q&A 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 natur...

1 answer  ·  posted 5y ago by Ryan Chase‭  ·  last activity 5y ago by System‭

Question shelter sun rain-gear
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Q&A 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 th...

5 answers  ·  posted 5y ago by James Jenkins‭  ·  last activity 5y ago by System‭

Question sun
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Q&A 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 es...

1 answer  ·  posted 6y ago by Charlie Brumbaugh‭  ·  last activity 6y ago by System‭

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Q&A 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 techniqu...

1 answer  ·  posted 6y ago by Ken Graham‭  ·  last activity 6y ago by System‭

Question camping cooking sun
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Q&A 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...

1 answer  ·  posted 8y ago by erik‭  ·  last activity 7y ago by System‭

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