Has the Sun's color changed?

Hi

I recently noticed that the sun is whiter than I used to remember it
when I was a child. The sun I remember was yellow. A few weeks ago I was
driving with sun in my eyes and the Sun looked very very white. Change in
color could indicate many things, among those are change in the temperature
of the sun, change in atmospheric condition on earth etc.. I wonder do any
body have any data that measures sun's average radiation at any particular
frequency or wave length? Does these levels vary with 11 year sun's cycle?
This gave me the idea that the sun might have longer cycles than 11 years.
These cycles could take say 100s or 1000s of years, and these cycles may
have caused the climatological change on earth.


Reagrds,
Babak

There are a chance this web page might explain the phenomena you are
describing. Everyone expeience this. chance are that you are very
observant.
http://www.psych.ucalgary.ca/PACE/VA...ite/monet.html

Kind rgds
vidar


"Babak Sehari" skrev i melding
...
Hi

I recently noticed that the sun is whiter than I used to remember it
when I was a child. The sun I remember was yellow. A few weeks ago I was
driving with sun in my eyes and the Sun looked very very white. Change in
color could indicate many things, among those are change in the
temperature
of the sun, change in atmospheric condition on earth etc.. I wonder do
any
body have any data that measures sun's average radiation at any particular
frequency or wave length? Does these levels vary with 11 year sun's
cycle?
This gave me the idea that the sun might have longer cycles than 11 years.
These cycles could take say 100s or 1000s of years, and these cycles may
have caused the climatological change on earth.


Reagrds,
Babak

There are a chance this web page might explain the phenomena you are
describing. Everyone expeience this. chance are that you are very
observant.
http://www.psych.ucalgary.ca/PACE/VA...ite/monet.html

Kind rgds
vidar


"Babak Sehari" skrev i melding
...
Hi

I recently noticed that the sun is whiter than I used to remember it
when I was a child. The sun I remember was yellow. A few weeks ago I was
driving with sun in my eyes and the Sun looked very very white. Change in
color could indicate many things, among those are change in the
temperature
of the sun, change in atmospheric condition on earth etc.. I wonder do
any
body have any data that measures sun's average radiation at any particular
frequency or wave length? Does these levels vary with 11 year sun's
cycle?
This gave me the idea that the sun might have longer cycles than 11 years.
These cycles could take say 100s or 1000s of years, and these cycles may
have caused the climatological change on earth.


Reagrds,
Babak

No, the sun has not changed color significantly. It will become somewhat
redder in the distant future, but not over the period of a lifetime. To me,
it looks about the same as it did as a child, although the yellowing of the
eye's lens over time may cause a change in the perception of the color. Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

No, the sun has not changed color significantly. It will become somewhat
redder in the distant future, but not over the period of a lifetime. To me,
it looks about the same as it did as a child, although the yellowing of the
eye's lens over time may cause a change in the perception of the color. Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

I had cataract surgery several years ago. With the new plastic lens,
suddenly white is white!

Bob

"David Knisely" wrote in message
...
No, the sun has not changed color significantly. It will become somewhat
redder in the distant future, but not over the period of a lifetime. To
me,
it looks about the same as it did as a child, although the yellowing of
the
eye's lens over time may cause a change in the perception of the color.
Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

I had cataract surgery several years ago. With the new plastic lens,
suddenly white is white!

Bob

"David Knisely" wrote in message
...
No, the sun has not changed color significantly. It will become somewhat
redder in the distant future, but not over the period of a lifetime. To
me,
it looks about the same as it did as a child, although the yellowing of
the
eye's lens over time may cause a change in the perception of the color.
Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

I gave it a thought that my eye lens might be "yellowed". Then again, I
used to remember that the sun
looked like a tangstan light bulb. Today, the tangstan light bulb is the
same color as it used to be, but the
sun is whitter! Plus, I just had an eye exam 3 month ago, which showed my
eyes are in perfect health.

The models we have for the sun or any star, only takes into acoount the
gravty and heat generated by
nuclear energy. It does not take into account many other known and unkown
phenomena, such as electric
charging or magnetic forces present on that star. So we roughly know that
the sun will end up red and
large, but before it gets there it could go through many types of transiant
states not known to us. For eample a
simple model of earth suggest that it rotated around itself and around the
sun. However, we know the
earth is more complicated than that. For example shifting of continants,
earth's interaction with moon causing ebb
and flow of the occw\eans, its maganetic pole, its electric charge, its
balck body radiation as a function of the
atmospheric conditaion, etc.

In my opinion the only way to resolve this question is to make a careful
measurement. I have seen some papers
written for solar cells in the 70s and 80s that have measured the sun's
radiation spectrum. We could do another
measurement and compare the results. Further more, since the sun is very
important for us, we really should
monitor it more carefully. Of course, we can not do a thing about these
changes for forseeable future, but at least
we can plan to deal with it in the earth.

Regards,
Babak


"Bob Weber" wrote in message
news:al_Ya.102082$uu5.15119@sccrnsc04...
I had cataract surgery several years ago. With the new plastic lens,
suddenly white is white!

Bob

"David Knisely" wrote in message
...
No, the sun has not changed color significantly. It will become
somewhat
redder in the distant future, but not over the period of a lifetime. To
me,
it looks about the same as it did as a child, although the yellowing of
the
eye's lens over time may cause a change in the perception of the color.
Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

I gave it a thought that my eye lens might be "yellowed". Then again, I
used to remember that the sun
looked like a tangstan light bulb. Today, the tangstan light bulb is the
same color as it used to be, but the
sun is whitter! Plus, I just had an eye exam 3 month ago, which showed my
eyes are in perfect health.

The models we have for the sun or any star, only takes into acoount the
gravty and heat generated by
nuclear energy. It does not take into account many other known and unkown
phenomena, such as electric
charging or magnetic forces present on that star. So we roughly know that
the sun will end up red and
large, but before it gets there it could go through many types of transiant
states not known to us. For eample a
simple model of earth suggest that it rotated around itself and around the
sun. However, we know the
earth is more complicated than that. For example shifting of continants,
earth's interaction with moon causing ebb
and flow of the occw\eans, its maganetic pole, its electric charge, its
balck body radiation as a function of the
atmospheric conditaion, etc.

In my opinion the only way to resolve this question is to make a careful
measurement. I have seen some papers
written for solar cells in the 70s and 80s that have measured the sun's
radiation spectrum. We could do another
measurement and compare the results. Further more, since the sun is very
important for us, we really should
monitor it more carefully. Of course, we can not do a thing about these
changes for forseeable future, but at least
we can plan to deal with it in the earth.

Regards,
Babak


"Bob Weber" wrote in message
news:al_Ya.102082$uu5.15119@sccrnsc04...
I had cataract surgery several years ago. With the new plastic lens,
suddenly white is white!

Bob

"David Knisely" wrote in message
...
No, the sun has not changed color significantly. It will become
somewhat
redder in the distant future, but not over the period of a lifetime. To
me,
it looks about the same as it did as a child, although the yellowing of
the
eye's lens over time may cause a change in the perception of the color.
Clear
skies to you.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 10th Annual NEBRASKA STAR PARTY *
* July 27-Aug. 1st, 2003, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

"Babak Sehari" wrote in message
...
Hi

I recently noticed that the sun is whiter than I used to remember it
when I was a child. The sun I remember was yellow. A few weeks ago I was
driving with sun in my eyes and the Sun looked very very white. Change in
color could indicate many things, among those are change in the
temperature
of the sun, change in atmospheric condition on earth etc.. I wonder do
any
body have any data that measures sun's average radiation at any particular
frequency or wave length? Does these levels vary with 11 year sun's
cycle?
This gave me the idea that the sun might have longer cycles than 11 years.
These cycles could take say 100s or 1000s of years, and these cycles may
have caused the climatological change on earth.


Reagrds,
Babak



Another thing is the fact that you say you noticed this when you were
driving with the sun in your eyes. Actually, that's a more likely
explanation that atmospheric conditions -- sorry to have overlooked it
before. Someone can explain how there is some threshold beyond which your
eye and brain cannot decode brightness into meaningful data, and why staring
at the sun, in fact, can blind a person entirely.


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