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2. Horizontal coordinate system - Wikipedia

   en.wikipedia.org/wiki/Horizontal_coordinate_system

   There are the following special cases: [a] All directions are south when viewed from the North Pole, and all directions are north when viewed from the South Pole, so the azimuth is undefined in both locations. When viewed from either pole, a star (or any object with fixed equatorial coordinates) has constant altitude and thus never rises or sets.

3. Altazimuth mount - Wikipedia

   en.wikipedia.org/wiki/Altazimuth_mount

   In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]

4. Telescope mount - Wikipedia

   en.wikipedia.org/wiki/Telescope_mount

   Alt-alt mounts, or altitude-altitude mounts, are designs similar to horizontal equatorial yoke mounts or Cardan suspension gimbals. This mount is an alternative to the altazimuth mount that has the advantage of not having a blind spot near the zenith, and for objects near the celestial equator the field rotation is minimized. [7]

5. OtterBox - Wikipedia

   en.wikipedia.org/wiki/Otterbox

   Otter Products, LLC, or simply OtterBox, is an American privately owned consumer electronics accessory company based in Fort Collins, Colorado, that produces cases for mobile devices. The company was founded in 1998 as a manufacturer of water-resistant boxes meant to house electronic devices, mostly catering to outdoor enthusiasts . [ 2 ]

6. LifeProof - Wikipedia

   en.wikipedia.org/wiki/LifeProof

   LifeProof was founded in 2009 by Gary Rayner. [2] He is a serial entrepreneur and has an MBA in Business from Queensland University of Technology. [3] After 18 months and a $1 million investment, the company made its public debut at the 2011 LAUNCH Conference where it won awards for the best product and best presentation after a demonstration with a LifeProof-protected iPhone 4 that included ...

7. Celestron - Wikipedia

   en.wikipedia.org/wiki/Celestron

   The predecessor of Celestron was Valor Electronics, an electronics and military components firm founded in 1955 by Tom Johnson. [1] [2] [3] Johnson became involved with telescopes when he built a 6" reflecting telescope for his two sons. [2] In 1960, Johnson established the "Astro-Optical" division of Valor, which would later become Celestron. [3]