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New from the MySociety genii:, capsule the curiously-capitalised PlaceOpedia. Think Google Maps ? Wikipedia. Brilliant. Except that, as I write, all the links read
15 May, 2006 at 8:45 pm
One of my college tutors claimed that the sun was green, and only appeared yellow because it was bright enough to saturate the blue receptors in our eyes. We would see an artificially blue-limited sun, red-shifting its appearance. And if you red-shift green you get yellow. Ta da.
I have no idea whether this is true or not, but I tell it to people as often as possible.
(btw: Thanks for the mention; the lightcone link points to mindhacks.com by mistake; sorry for attaching this part of the comment to the wrong post; please post a photo of the Christmas Lectures model, if you have one!)
15 May, 2006 at 9:27 pm
Green? Green! Pfff! It’s white, I tell you! White! White until… until it becomes a bit orangey, way off in the far future!
It genuinely amuses me how impassioned astronomers become when the subject is broached. Roll on the days when more of us have ventured beyond the atmosphere and seen it through our own eyes. Though… does a gold filter taint the source green, or… ?
Link fixed – good spot, thanks!
As for a still of the RI model – I think I have one somewhere, but the plain fact is, as a flat image, on a print or on TV, it looked rubbish. In person it was stunning, but on screen – dull. Harrumph.
15 May, 2006 at 9:48 pm
It’s puce I tell you, the sun is puce.
Anyone who tells you otherwise is trying to sell you something. Or commit you. I forget which…
16 May, 2006 at 1:24 pm
Nah, I have to tell you it’s beige. Like everything else round here…
16 May, 2006 at 7:49 pm
On this matter, I would advise against trusting the opinion of anybody who lives in Glasgow.
They have ‘theories’ about the colour, of course.
18 May, 2006 at 7:12 pm
Well, TV’s whitepoint is based on a particular overcast sky in New York in the 60’s, if I recall correctly, which is why it is 6500K instead of 5500K. So sunlight would be yellower on TV.
The RI lecture I remember on this was the one where they showed the film made by getting a woman who was colourblind in one eye to tell them when they had the colours matching in both. I can’t remember which one this was though (my dad used to get us tickets to them, years ago).
23 May, 2006 at 9:19 pm
Just to add my ha’pence worth I personally go completely with the colour of snow argument. The Sun is the definition of white.
I developed this idea independently when I worked on the Xmas lectures with Malcolm Longair (an Astronomer) who sided with the Yellow camp.
The Producer of those lectures never argued with Malcolm but definitely sided with white.
25 May, 2006 at 12:22 pm
Yes, Bryson – as I recall, the counter-argument mentioned above was indeed yours. It still rings true to me, and I still think Malcolm was dead wrong. But heigh-ho.
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