rotational-symmetry

So I’ll be writing a proposal over the next couple of months to observe at the Large Millimeter Telescope in Mexico:

The proposal will have to do with getting a much higher accuracy for small body observations in the solar system (correcting for things like rotational period and geometric symmetry)

(Image credit: UMass Amherst/Smith College/James Lowenthal, UMass Amherst and Large Millimeter Telescope Alfonso Serrano respectively)

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Check out how the striations on the surface of this ruby record the growth of the different faces and the 6-fold symmetry rotation axis. 

Brush sets from CA

Since CloudAlpaca focuses more on the manga industry, they provided different brushes than the ones for FireAlpaca. There are three brushes: GPen, MaruPen and the Rotational Symmetry (similar to the symmetry brush).

External image
External image

You can get these files from the config folder (Help > Open Config folder > brush_script) or download it here. :)

I think a #brush hashtag is appropriate here…

6

Figuring Out How to Fold Solar Panels, Airplane Wings

The art of paper-folding called origami can produce complex shapes that are both beautiful and useful. It is being used to understand how DNA works, to make powerful microscopes out of paper, and to improve architecture and medicine

But if you want to convert something flat into another shape to reduce its size for packing and shipping, origami folds need to get even more complex for thicker objects. How, for instance, would you fold a space mirror for delivery into orbit or a new generation of retracting roofs, shape-shifting airplane wings or solar panels?

The answer, according to researchers at Oxford and China’s Tianjin University, is that you need to add hinges, extra material and crease offsets to produce origami’s smart folds in thick objects. Learn more and see more images below.

Keep reading

VESICA PISCIS

The Vesica Piscis is a symbol made from two circles of the same radius, intersecting in such a way that the center of each circle lies on the circumference of the other. The name literally means the bladder of the fish in Latin. In the Christian tradition, it is a reference to Christ, as in ichthys. It is called a mandorla (“almond”) in India and known in the early Mesopotamian, African, and Asian civilizations.

Geometry – The symbol is formed from the almond-shaped area in the overlap between the circles, as shown in black in the diagram - for certain purposes also including the upper arcs as far as the edges of a rectangle whose sides coincide with the widest points of the almond (as shown in light blue in the diagram). The resulting figure looks like a stylized fish, or in the extended version like a flattened Greek letter alpha.

Mystical and Religious Significance - It has been the subject of mystical speculation at several periods of history, perhaps first among the Pythagoreans, who considered it a holy figure. The mathematical ratio of its width (measured to the endpoints of the “body”, not including the “tail”) to its height was reportedly believed by them to be 265:153. This ratio, equal to 1.73203, was thought of as a holy number, called the measure of the fish.

The geometric ratio of these dimensions is actually the square root of 3, or 1.73205… (since if you draw straight lines connecting the centers of the two circles with each other, and with the two points where the circles intersect, then you get two equilateral triangles joined along an edge, as shown in light red in the diagram).

The ratio 265:153 is an approximation to the square root of 3, with the property that no better approximation can be obtained with smaller whole numbers. The number 153 appears in the Gospel of John (21:11) as the exact number of fish Jesus caused to be caught in a miraculous catch of fish, which is thought by some to be a coded reference to Pythagorean beliefs. Ichthys a symbol used by early Christians, more popularly known as the fish symbol is created by the almond shape and the light blue extension as seen in the Construction Diagram of the Vesica Pisces above.

Uses of the shape – Other uses of the shape include that by some early peoples of the almond-shaped central area as a representation of the female genitals, and the use of a similar (horizontally-oriented) fish symbol called the Ichthys by early Christians. In Christian art, some aureolas are in the shape of a vertically oriented vesica piscis, and the seals of ecclesiastical organizations can be enclosed within a vertically oriented vesica piscis (instead of the more usual circular enclosure). The most common modern object based on the vesica piscis is the American football, which resembles the interior almond-shaped area of the vesica piscis swept about its long “axis” to produce a 3D object with rotational symmetry.

 

anonymous asked:

websites that help distract from dysphoria and anxiety???

There are a lot but here are some ones that I use:

http://thisissand.com/ You pour sand. There is some background noise of the sand being poured. You can also change the color of the sand.

http://weavesilk.com/ Make art with rotational symmetry!

http://emergencycompliment.com/# This site gives you a stream of compliments. The colors of the background are a little bit bright and do sometimes change from compliment to compliment. If you press “meh” then it’ll give you a new one. Sometimes an advert comes up asking you to buy their book but you can x out of that.

http://philome.la/Nuan_Mizan/super-bun-rpg-2000/play A text only twine where you’re a bunny. Some of the text has a glow effect which might be a bit eye straining.

https://vimeo.com/79369173 This is a video of someone carving and painting a doll. It’s really relaxing.

I’ve got more but I think that’s a pretty good selection!

–Ell