|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
TOTALLY Saw Great Heidinger's "Brushes" This Afternoon
Wow!
Perfect seeing conditions at sunset in Manchester this afternoon! (If you'll forgive the verbless "sentence".) Looked up and there it was in all its glory! The sky was perfectly clear and blue almost everywhere, though there was some haze nearer the horizon. Up overhead the "brush" was very clearly visible. And it seems to be true that away from the sun, the yellowish bow-tie points towards the sun, but nearer to the sun, it's at right angles to that direction. I was pleased that I managed to see that. I feel satisfied. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
#2
|
|||
|
|||
I came across this effect quite recently, and discovered that I can see it
on any white space on my LCD computer monitor. However, it exhibits confusing behaviour. If I rotate my head slowly to the right (i.e. clockwise) around an axis connecting the back of my head to my nose, I see the yellow smudges fixed relative to the computer screen and aligned to 1 o'clock - 7 o'clock. If I rotate my head slowly the other way, ditto but aligned to 8 o'clock- 2 o'clock. If I keep my head still, the brus fades away (presumably due to colour fatigue). So the brush is fixed relative to the screen, backing up the idea that it is fixed relative to polarisation, but I can see it in either of two positions at 90 degrees to each other, *not* consistent with it being reliably aligned to *one of* either the polarisation of the E-field or H-field vectors. "Fleetie" wrote in message ... Wow! Perfect seeing conditions at sunset in Manchester this afternoon! (If you'll forgive the verbless "sentence".) Looked up and there it was in all its glory! The sky was perfectly clear and blue almost everywhere, though there was some haze nearer the horizon. Up overhead the "brush" was very clearly visible. And it seems to be true that away from the sun, the yellowish bow-tie points towards the sun, but nearer to the sun, it's at right angles to that direction. I was pleased that I managed to see that. I feel satisfied. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
#3
|
|||
|
|||
P.S. just realised that these orientations (which are approximate) aren't
separated by 90 degrees ! "Alan" wrote in message ... I came across this effect quite recently, and discovered that I can see it on any white space on my LCD computer monitor. However, it exhibits confusing behaviour. If I rotate my head slowly to the right (i.e. clockwise) around an axis connecting the back of my head to my nose, I see the yellow smudges fixed relative to the computer screen and aligned to 1 o'clock - 7 o'clock. If I rotate my head slowly the other way, ditto but aligned to 8 o'clock- 2 o'clock. If I keep my head still, the brus fades away (presumably due to colour fatigue). So the brush is fixed relative to the screen, backing up the idea that it is fixed relative to polarisation, but I can see it in either of two positions at 90 degrees to each other, *not* consistent with it being reliably aligned to *one of* either the polarisation of the E-field or H-field vectors. "Fleetie" wrote in message ... Wow! Perfect seeing conditions at sunset in Manchester this afternoon! (If you'll forgive the verbless "sentence".) Looked up and there it was in all its glory! The sky was perfectly clear and blue almost everywhere, though there was some haze nearer the horizon. Up overhead the "brush" was very clearly visible. And it seems to be true that away from the sun, the yellowish bow-tie points towards the sun, but nearer to the sun, it's at right angles to that direction. I was pleased that I managed to see that. I feel satisfied. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
#4
|
|||
|
|||
Isn't it spelt "Haidinger"?
"Fleetie" wrote in message ... Wow! Perfect seeing conditions at sunset in Manchester this afternoon! (If you'll forgive the verbless "sentence".) Looked up and there it was in all its glory! The sky was perfectly clear and blue almost everywhere, though there was some haze nearer the horizon. Up overhead the "brush" was very clearly visible. And it seems to be true that away from the sun, the yellowish bow-tie points towards the sun, but nearer to the sun, it's at right angles to that direction. I was pleased that I managed to see that. I feel satisfied. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
#5
|
|||
|
|||
In ,
Alan typed: I came across this effect quite recently, and discovered that I can see it on any white space on my LCD computer monitor. However, it I have been trying it with a polarising filter in front of a CRT monitor displaying a white screen and can clearly see it, especially when I rotate the filter. With the filter stationary it fades away. Haven't seen it "in the wild" yet. Jo |
#6
|
|||
|
|||
Isn't it spelt "Haidinger"?
Yes. I was typing in a hurry before. Martin -- M.A.Poyser Tel.: 07967 110890 Manchester, U.K. http://www.fleetie.demon.co.uk |
#7
|
|||
|
|||
"Jo" wrote
In , Alan typed: I came across this effect quite recently, and discovered that I can see it on any white space on my LCD computer monitor. However, it I have been trying it with a polarising filter in front of a CRT monitor displaying a white screen and can clearly see it, especially when I rotate the filter. With the filter stationary it fades away. Haven't seen it "in the wild" yet. Jo Good, innit?! Today (in Manchester) was a good day for seeing it. Looked up at it loads of times throughout the day. It certainly is true that the ability to see it develops with practice, once you "know"/recognise what you're looking for. Maybe you kind of end up "de-training" the brain from "compensating it out" a bit, as you practise more. Martin -- M.A.Poyser Manchester, U.K. http://www.fleetie.demon.co.uk |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
GREAT WALL OF CHINA - Why It Was Built | Ed Conrad | Astronomy Misc | 2 | August 12th 04 01:57 AM |
UFO Activities from Biblical Times (Long Text) | Kazmer Ujvarosy | UK Astronomy | 3 | December 25th 03 11:41 PM |
UFO Activities from Biblical Times (LONG TEXT) | Kazmer Ujvarosy | SETI | 2 | December 25th 03 08:33 PM |
UFO Activities from Biblical Times | Kazmer Ujvarosy | Astronomy Misc | 0 | December 25th 03 06:21 AM |
The Late, Great Immanuel Velikovsky, This One's for YOU! | Ed Conrad | Astronomy Misc | 17 | September 28th 03 04:49 PM |