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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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Lebanon says efforts intensify to reach ceasefire in the country
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Efforts to achieve a ceasefire in Lebanon have intensified over the past few hours, according to Lebanese Prime Minister Najib Mikati’s office, adding that contact between the United States and France is ongoing to revive a ceasefire proposal between Hezbollah and Israel.
US President Biden and his French counterpart Emmanuel Macron proposed a 21-day ceasefire during the UN General Assembly last month. Israel assassinated Hezbollah’s leader Hassan Nasrallah three days after the proposal and launched intensive attacks on the group, derailing the talks.
Netanyahu publicly rejected a ceasefire ahead of the assassination. Prospects for a truce diminished further after Iran, who backs Hezbollah, fired a barrage of missiles on Israel last week.
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“There are contacts taking place between the United States and France…with the aim of reviving the declaration of a ceasefire for a specific period in order to resume the search for political solutions,” Mikati’s office said on X, citing the prime minister.
Mikati said his government is ready to implement the 2006 Security Council Resolution 1701, which called for a permanent ceasefire and end to hostilities between Hezbollah and Israel. The resolution also stipulates that Hezbollah forces must withdraw north of the Litani River in Lebanon, and that only the Lebanese military should hold positions in the border area.
Hezbollah’s top official Naim Qassem said Tuesday that his group backs ceasefire efforts spearheaded by Shia allies inside Lebanon. This was the first time the group publicly endorsed a truce and didn’t condition it on stopping the war in Gaza.
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