Actually, I dont think thats true. There is less blue and violet at sunrise AND sunset due to the shorter wave lengths of light being scattered more as they pass through more of the atmosphere. The blue/short wave lengths have a longer path at both times of the day, so the scatering/absorbsion is the same. You will get more blue mid day and more red morning AND evening.
Just go look at a sunrise and a sunset - both are red.
Or Google it 
Almost - again due to the longer path through the atmosphere. In summer the sun is directly over head (shortest distance) and winter its lower in the sky (longest distance. Spring and autumn are both the same distance (half way in between), so will have the the same colors.
Here is a pretty good summary.
All âtwilight phenomenaâ are symmetric on opposite sides of midnight, and occur in reverse order between sunset and sunrise, the authors note in âColor and Light in Natureâ (Cambridge University Press, 2001). That means thereâs no inherent, natural cause of a major optical difference between them. However, two human factors break their symmetry.
The first is in our heads. âAt sunset, our eyes are daylight adapted and may even be a bit weary from the dayâs toil,â Lynch and Livingston write. âAs the light fades, we cannot adapt as fast as the sky darkens. Some hues may be lost or perceived in a manner peculiar to sunset. At sunrise, however, the nightâs darkness has left us with very acute night vision and every faint, minor change in the skyâs color is evident.â In short, you may perceive more colors at dawn than at dusk. [Red-Green & Blue-Yellow: The Stunning Colors You Canât See]
Human activities also drive a divergence between them. âAt sunset the sky is full of pollutants and wind-borne particles,â the authors write. âDuring the night, winds die down, smog-producing urban activity eases and the atmosphere cleanses itself. The dawn is clearer than any other time of day.â
Itâs a matter of opinion whether pollution or a lack of it makes for prettier twilights. At dawn, clearer skies enable more brilliant reds and oranges to make their way through the atmosphere to your eyes, whereas thicker atmospheres at dusk tend to dull these colors, leading to more washed-out sunsets. On the other hand, more dust and smog (at sunset) can have the effect of scattering light across a greater region of the sky, creating a larger drape of colors, whereas sunrise colors tend to be more focused around the sun. Whichever you prefer, you can frequently tell a sunrise from a sunset by the fact that the latter appears more chaotic, and the former, tidier.
According to the astrophysicist Neil Degrasse Tyson, director of the Hayden Planetarium in New York, thereâs also a trick for distinguishing a sunrise from a sunset played in reverse. Because of Earthâs tilt, the sun doesnât rise or set along a vertical line, but at an angle. âWhen viewed from all latitudes north of the Tropic of Cancer (23.5 degrees north latitude), the sun always rises at an angle up and to the right, and sets and an angle down and to the right,â Tyson writes on his website. âThatâs how you can spot a faked sunrise in a movie: it moves up and to the left. Filmmakers are not typically awake in the morning hours to film an actual sunrise, so they film a sunset instead, and then time-reverse it, thinking nobody will notice.â
So if you see a rising sun move up and to the left, you know youâre in the twilight zone. Better head back to the hospital.
Thanks a lot for your info: it sound logic.
Pero yo leĂ @anon32470837, que segĂșn avanza la primavera hacia el verano la luz solar va ganando azul y perdiendo rojo: la planta fotodependiente lo detecta como señal de crecer vegetando.
Y al revĂ©s, segĂșn el Verano avanza hacia el Otoño la luz gana rojo sobre el azul dĂa a dĂa: señal para florecerâŠ(solo una señal mĂĄs para la planta, aparte del nĂșmero de horas de luzâŠ)
But I read that as spring advances towards summer, the sunlight is gaining blue and losing red: the photodependent plant detects it as a sign of growing vegetating. And vice versa, according to the Summer it advances towards the Autumn the light gains red on the blue day to day: signal to bloom ⊠(only one more signal for the plant, besides the number of light hoursâŠ) âŠ
Makes sense but isnt red the first colour in the spectrum to be filtered out?
Thats why army use red lights at night as it has least penetration
or is that just in human visible spectrum?
just reread your post and it makes sense that they are the inverse of each other
just had a google and come to the conclusion that what Iâd heard was bollocks from another âUK centricâ forum
the red thing is something I remember from scuba diving guess light is different underwater
No, blue is the first to be filtered out. Thats due mostly to scattering as the light goes through the atmosphere.
The red light at night thing is because red light doesnt make your eye pupils contract as much as blue or white light does. In other words, your ânight visionâ isnt effected by red light as much as it is by blue light. Blue lights at night cause your pupils to contract more, so you cant see as well.
Thatâs why the ocean is blue as well.
8/8 of the Creme Brulee are up as of this morning. The first 7 got transplanted last night with some VAM mycorrhizae. The 8th popped her head out of the rooter this morning. They are under a dome so I can slowly open the vents and harden them off. I will probably chop the autos early if I need the room/soil for these.
EDIT: Here is a web cam shot.
Very nice! and a cracking wee grow chamber too bro. Been following this thread of yours with interest, not least because of my own venture into led. Iâm amazed so far and there does seem to be an increase in resin production too on herselfs autos. Cant wait to see how mine get on now with the new rig.
Looking at that photo makes me feel high⊠oh wait, i am high. 
The Juanita la Lagrimosa clone is still struggling to get acclimated to the no-till bed. She will come around sooner than later.
This is a little volunteer seed that popped up at the end of the last grow. My assumption is this is one of the seeds from the Ancestral Skunk #1 that had intersex flowers.
or is it one that failed to come up in the past ?
Either way, I doubt its going to live very long. Im going for a full screen this time. 
The Blueberry in the 1x1x5 is about done at 8.5 weeks. Iâll give her a few more days, but she is starting to foxtail everywhere. This plant has been mainly ignored once she started flowering. Just kinda doing her thing. I think I will plant the Freedom Dream in here next. I have a clone of this, but not sure if I will bother running her again. They always get a smoke test before being culled.
The Juanita clone is finally starting to green up. I need to give her a good topping of worm castings. That should bounce her right back. I installed the screen again and am starting to train her under it. This time I went with hemp twine instead of the pink nylon. The reason for the change was after trimming last round, I found a few buds with pink stains on them. Whatâs the point of growing organic if you have pink dye on your buds?
All eight of the Creme Brulee are up and transplanted to paper cups. Iâm not sure why a couple of them have a bit of leaf curl, but I think maybe I opened the vents on the dome too soon.
I got the pots all setup for the Creme Brulee, recycled soil watered in with aloe and topped with straw. I was out of the 12-clover blend I usually use as a living cover crop. Instead I used some sprouting seeds I had (for eating) that contains mostly alfalfa but also some legumes and broccoli. Iâll see how that works out and order more of the 12-clover blend.
The monkeys were asleep, but I took a quick shot of one of the main colas. Not too shabby for 30 days 12/12.
Next round, I will flower a little bit earlier. The buds on the edges arenât getting enough light to fatten up like I would have liked. Other than that, they are happy, healthy, and vigorous.
Looking so good c.f. Mechelle
As always tip top work. This is pretty much what Iâm gonna be switching to
Only with more height I hope 
7â in the big tent. A little over 6â in the other
