Cheers. Decided to read up a bit as my dumb ass clearly didnt retain much from school!
This site is pretty decent at explaining things to idiots like me 
https://www.shsu.edu/~dl_www/bkonline/131online/f02latitude/02index.htm
I went out today – cloudy, no sun, not hot – checked the UV index and it was an 8+ (very high).
fyi
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Its often bad in taiwan. Few days ago i was in the bed all day puking and shitting. 2 days off work from the sun burns. Will start peeling tomorrow. Oh how i miss winter!
Ps. 2 hours 4pm to 6pm last week, cloudy. Sucks being a big nose.
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Damn my app always says after about 3:30 sunscreen isn’t needed.
I beg to differ… 
I had my worst ever sunburn less than a month after moving here while cycling in September without protection. I was miserable for quite a few days. Since then, I moved to arm and leg UV protection sleeves while in the mountains or the countryside.
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Ya, they help a lot! I used to be the opposite, but now i opt on the heat stroke side rather than the sun stroke side
Actually, having less skin directly exposed to the sun help to cool you down.
Im sure there is science in that. But i bake and puke wearing pants and long sleeves. I need the evaporation and air movement to let my sweat cool me down.
The sun already feels hot. I wonder what the UV index is today
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Go to the shade. If still hot, think about greenhouse effect and air particles, not just the sun. Clean areas of Taiwan are clean and comfy under a tree currently.
It’s that time of the year. Or maybe always that time of year in Taiwan.
Avoid extended sunshine between 10:00 and 2:00 or longer. Use protection.
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I cannot understand how sunglasses are not more widespread in Taiwan. Sure, some people wear them, but it feels more like a minority.
If I step out on a day like today without them, I immediately have to squeeze my eyes because the sun is just too bright for me.
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Perhaps, as with the denizens of the Tibetan Plateau, or the high arctic, natural selection has reduced the need to squeeze the eyes…
I think Taiwan people carry what they’re going to use most often.
Umbrellas, going to need much more often than sunglasses.
Sunglasses, Taiwanese avoid the sun at all costs so rarely need.
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Not an excuse. But perhaps an issue. Many taiwanese already have poor eyesight and require regular glasses. Which are expensive even here. To get prescription sunglasses is just even more money. They sell very large sunglasses that fit over regular glasses. Which is cool, but from what I see limits the regular glasses loss of wide angle even more. Would be terrifying having a taiwnaese driver then wearing glasses (blocking side angles) then dimming the light and cutting out even more side angles haha.
Brown eyes are less sensitive to sunlight than blue and green. Probably why that genetic mutation happened in the north.
Transition lenses