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When you enter into any new area of science, you almost always find
yourself with a baffling new language of technical terms to learn before you can converse with the experts. This is certainly true in astronomy both in terms of terms that refer to the cosmos and terms that describe the tools of the trade, the most prevalent being the telescope. So to get us off of first base, let’s define some of the key terms that pertain to telescopes to help you be able to talk to them more intelligently. The first area of specialization in telescopes has to do with the types of telescopes people use. The three designs of telescopes that most people use are the Refractor, the Reflector and the Schmidt Cassegrain telescope. The refractor telescope uses a convex lens to focus the light on the eyepiece. The reflector telescope has a concave lens which means it bends in. It uses mirrors to focus the image that you eventually see. The Schmidt Cassegrain telescope uses an involved system of mirrors to capture the image you want to see. A binocular telescope uses a set of telescopes mounted and synchronized so your view of the sky is 3-D. Beyond the basic types, other terms refer to parts of the telescope or to the science behind how telescopes work. Collimation is a term for how well tuned the telescope is to give you a good clear image of what you are looking at. You want your telescope to have good collimation so you are not getting a false image of the celestial body. Aperture is a fancy word for how big the lens of your telescope is. But it’s an important word because the aperture of the lens is the key to how powerful your telescope is. Magnification has nothing to do with it, its all in the aperture.
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The surprising history of the Fair Isle sweater
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Which fashion item is as beloved by members of the royal family as it is by JLo? Or as relevant on the runways of 2024 as in the knitting catalogs of 1960? The answer is surprisingly festive. The Fair Isle knit, a two-stranded knitting tradition originating off the coast of Scotland, has been a wardrobe staple for well over 100 years — keeping everyone from 18th century fisherman to Mick Jagger warm.
In the last five years, luxury brands Ralph Lauren, Thom Browne, Chanel, Celine, Balenciaga, Raf Simons, Versace and Dries van Noten have all sent their renditions of the heritage knit down the catwalk. London-based designer Molly Goddard has even made the pattern something of an unofficial signature, making sure to pair a structured Fair Isle-style knit with a flouncy, tulle skirt in almost every collection.
In short, it has become a winter classic that seems perpetually in vogue. Rom-com leading man, Adam Brody, recently wore a red and white version on the cover of Stylist magazine; while Katie Holmes was snapped running errands in an old beige Fair Isle favorite from 2022.
For those in the northern hemisphere, it’s appropriate to shrug on as soon as the nights draw in right until sweater weather deteriorates. That being said, even in season-less Los Angeles, stars like Hailey Bieber have been seen in the cozy Fair Isle knits grabbing coffees.
Taking its name from the island of Fair Isle — part of the Shetland archipelago about 100 miles off the northeastern coast of Scotland — the knitting technique first began in fisherman’s hats during the 18th and 19th century (our beloved sweaters came much later). The two strand pattern was not only artistic, but made the tall, conical shaped caps extra warm by doubling the textile mass. They often featured a knitted interior lining, too.
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