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Post by alex992 on Jun 29, 2018 13:06:59 GMT -5
Peak sun angle today is 87.09 degrees, has dropped ~0.3 degrees since the solstice.
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Deleted
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Post by Deleted on Jun 29, 2018 13:19:26 GMT -5
Currently 15.8° here.
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Post by nei on Jul 14, 2018 22:14:20 GMT -5
visualization to show why higher latitudes have a bigger decrease of sun angle than lower latitudes outside of solar noon [after the summer solstice, obviously]. Chart I made shows sun angle with time of day [where noon is solar noon not local time]. Every latitude has the same decrease in sun angle at solar noon from August 1 to September 1. The lower latitudes see barely any change in sunrise and sunset [obviously the times when the sun angle is 0], so near sunrise & sunset the sun angle isn't changing much there. While at the higher latitudes, there are big sunrise/sunset time changes, changing the sun angle more. You can see the curve of the higher latitudes gets "squeezed" more". alex992 Babu |
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Post by nei on Jul 25, 2018 10:08:16 GMT -5
Babu might like this line I found on wikipedia UV intensity can be higher or lower for surfaces at different angles to the horizontal. For example, if people are walking or standing outdoors, UV exposure to the eyes and vertical surfaces of skin, such as the face, can actually be more severe when the sun is lower (though UVB:UVA ratio can also differ)en.wikipedia.org/wiki/Ultraviolet_indexalso found this graph; surprised the difference between 40°N and 20°N wasn't bigger around noontime. Of course, a few months later the difference would be much bigger. The UV Index is the dose rate on the y-axis / 25. 
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Post by Babu on Jul 25, 2018 11:02:24 GMT -5
Oh. Never realized UV index was measured against horizontal surfaces. That's . Should be measured perpendicular to the sun.
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Post by chesternz on Jul 26, 2018 6:14:00 GMT -5
Peak sun angle is now 84 deg and rising. Our next solstice is on August 16.
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Post by Hiromant on Jul 26, 2018 7:07:32 GMT -5
Last day at 50+° sun angles. I'm glad, the incessant radiation this summer is tiring.
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Post by Morningrise on Sept 4, 2018 18:10:46 GMT -5
Today the sun angle peaked at 44.9° in Saskatoon, our first day of the season below 45° - the next time it goes back up above 45° will be April 8th next year.
The peak sun angle is currently dropping by about 1.1° every three days, late afternoon light is noticeably softer and more golden than it was even just a couple weeks ago.
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Post by Cadeau on Sept 5, 2018 7:40:33 GMT -5
Paris
Today (5 September 2018)
Solar Noon(47.9°): 13:49
Above 30°: 10:25~17:13
Above 20°: 9:20~18:18
Above 10°: 8:18~19:20
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Post by Hiromant on Sept 11, 2018 6:28:17 GMT -5
35,2° today, about the same as Longyearbyen on the summer solstice.
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Post by Cadeau on Sept 17, 2018 5:46:23 GMT -5
Paris
Today (17 September 2018)
Solar Noon(43.3°): 13:44
Above 30°: 10:48~16:42
Above 20°: 9:39~17:51
Above 10°: 8:35~18:54
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Post by nei on Sept 22, 2018 11:55:43 GMT -5
happy equinox
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Post by Cadeau on Oct 7, 2018 16:20:25 GMT -5
Paris
Tomorrow (8 Octobre 2018)
Solar Noon(35.2°): 13:38
Above 30°: 11:46~15:30
Above 20°: 10:17~16:58
Above 10°: 09:08~18:08
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Post by Hiromant on Oct 9, 2018 9:11:05 GMT -5
24,4° today. Super cloudy lately though.
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Post by Ski on Nov 11, 2018 2:38:29 GMT -5
25.4 today.
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Post by Cadeau on Nov 11, 2018 4:30:36 GMT -5
Terre Haute
Today (11 November 2018)
Solar Noon(33.0°): 12:33
Above 30°: 11:13~13:54
Above 20°: 09:39~15:28
Above 10°: 08:32~16:35
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Paris
Today (11 Novembre 2018)
Solar Noon(23.7°): 12:34
Above 30°: -
Above 20°: 10:53~14:16
Above 10°: 09:12~15:57
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Post by Ski on Nov 12, 2018 9:07:31 GMT -5
Sun angle is 25.1. Last day with a 25 angle.
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Post by Morningrise on Nov 17, 2018 9:01:45 GMT -5
Today the sun angle peaks at 18.8 degrees here, only 4.3 degrees higher than on the solstice.
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Post by Ski on Nov 30, 2018 7:08:32 GMT -5
21.2.
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Post by Hiromant on Nov 30, 2018 7:11:53 GMT -5
9° here, a few more degrees to go.
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