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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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留学等の国内居住要件の例外として認められる海外在住の被扶養者に子どもが生まれた場合（例：被保険者の孫）については、一般的には、子が生まれた被扶養者は新たな世帯を形成することが想定されるが（その時点で当該被扶養者の帰国の蓋然性や被保険者との生計維持関係を満たす可能性が低くなることが考えられる）、その子（被保険者の孫）についても、配偶者の就労実態や経済的援助の状況を踏まえ、被扶養者及びその配偶者がともに現地で就労できないビザで滞在しているなど、被保険者が扶養する必要がある特別な事情があり、「日本人の配偶者等」、「定住者」、「家族滞在」等の在留資格により日本で生活すると予定されているなど、今後日本で生活する蓋然性が高いと認められる場合には国内居住要件の例外として認めて差し支えない。
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