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Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
Birdwatching is a very popular hobby among nature and animal lovers; a binocular is their most basic tool because most human eyes cannot resolve sufficient detail to fully appreciate and/or study small birds. [74] To be able to view birds in flight well rapid moving objects acquiring capability and depth of field are important.
The SkyScout was a handheld, battery powered device about 7.4" x 4.0" x 2.5", and weighing about 1 pound. It had a viewing port, a 3" x 1" LCD display on the side and several buttons for controlling and selecting device functions.
On Inauguration Day, do your own forest bathing, Bhaumik suggests: Spend time in nature using your senses to connect with the environment. Even better, silence your phone while you’re doing it.
Aging athletes such as LeBron James, Cristiano Ronaldo and Lindsey Vonn are similar to racing cars — maintained by tinkering mechanics, data analysts, and shelves of replacement parts “If you ...
The Summary. A NASA spacecraft brought samples from the asteroid Bennu back to Earth in 2023. The first in-depth analyses of that material have revealed organic molecules, including building ...
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