circumhorizontal arcs photographed by (click pic) david england, andy cripe, del zane, todd sackmann and brandon rios. this atmospheric phenomenon, otherwise known as a fire rainbow, is created when light from a sun that is at least 58 degrees above the horizon passes through the hexagonal ice crystals that form cirrus clouds which, because of quick cloud formation, have become horizontally aligned. (see also: previous cloud posts)
Just because a lunar landing anniversary needs a second post today.
45 years ago today, Apollo 11 landed on the first humans on the moon. Neil Armstrong and Buzz Aldrin spent 21.5 hours on the lunar surface.
That’s pretty much how it happened.
Perihelion and Aphelion
The closest point to the Sun in a planet’s orbit is called perihelion. The furthest point is called aphelion. Notice how the planet moves fastest at perihelion and slowest at aphelion.
The time during the year that aphelion and perihelion (when we are closet to the sun) changes over a roughly 100,000 year cycle, known as the Milankovitch Cycle. Our orbit around the sun is not a circle, it is an ellipse with an eccentricity of about 0.0167. This orbit both changes shape and rotates around the sun much like a spirogram tracing out a flower-like shape.
It is summer in the northern hemisphere, a time when people often say things like, “We are closer to the sun than we are in winter.” This is not really true. Summer is a product of the angle at which Earth is tilted, right now Earth is tilted so that the northern regions lean toward the sun. In terms of orbit we are actually at the furthest point Earth gets from the sun.
This has interesting implications in terms of the global climate. This means that right now winters tend to be warm (the planet is closer to the sun) and summers cool (the planet further from the sun). In the big picture this places us in the midst of a global cool cycle, the type of situation that tends to lead to ice ages, like the one we are emerging from.
Anónimo ha dicho: Hey Shychemist. I've been following your blog for awhile and I want to bring up something that seems dated but nonetheless holds to be accurate today. I feel like the girls who consider themselves to be on the science side of tumblr to be horribly mistaken. It's statistically proven that women applicants struggle to get into stem doctorate programs, and rightfully so, they don't belong there. examples- atomic-o-licious, brainsx , adventuresinchemistry, i can't fit anymore but you get it
It doesn’t seem dated, your attitude is dated. This is the 21st century.
Women deserve to be in STEM programs just as much as men. I’d wager they deserve to succeed in the Sciences even more than men because of the sexism and misogyny they experience.
They struggle to get in because they’re the minority, and a lot of people who could admit them are sexist (regardless of gender) because of the society they grew up in. Its not through any intellectual weakness. These women are amazing and just as smart as the men in their fields.
You have no right to say these things to these amazing women, many of whom I consider to be friends.
Wow. That seems like really fucking wrong. And offensive.
And I would love to take some more time out of my day to be pissed about it.
It seems that I have a lot of fucking science to do.
So, uh, screw that.
If anybody needs me, me and my lady bits will be getting some fucking science done.
I’m oddly excited to have been name checked by this shitty anon. Because it means that the very fact that I got into an Ivy League, top 15 science PhD program (where I fucking belong) is a giant fuck you to shitty anon. Also, shitty anons make Lewis sad. Because Lewis is a feminists science hippo.
Best way for me to deal with shitty nonnies who think women can’t do science? DO MORE SCIENCE!!!! MWAHAHAHA
Crap, I’m a woman biologist. I’d go get another career but I have a groundbreaking thesis on rapid evolution of reproductive isolation between seed beetle populations to finish.