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2. Barn door tracker - Wikipedia

   en.wikipedia.org/wiki/Barn_door_tracker

   A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount .

3. Louden Machinery Company - Wikipedia

   en.wikipedia.org/wiki/Louden_Machinery_Company

   August and Vera Luedtke Barn, sometimes the Fred and Vera Luedtke Barn, 1938 185th St., vicinity of Fairfield, Iowa (Architectural Department of the Louden Machinery Company) [1] McCafferty Run Farmstead, 17114 and 17226 OH 104, Chillicothe, Ohio (dairy barn north of the house attributed as a design of Louden Machinery Company), NRHP-listed [10 ...

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6. Astrophotography - Wikipedia

   en.wikipedia.org/wiki/Astrophotography

   They include commercial equatorial mounts and homemade equatorial devices such as barn door trackers and equatorial platforms. Mounts can suffer from inaccuracies due to backlash in the gears, wind, and imperfect balance, and so a technique called auto guiding is used as a closed feedback system to correct for these inaccuracies. [26]

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