First Sentence:
Two numbers, e.g. 10 x 50 or 11 x 80, designate a binocular.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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dew cap, altazimuth mount, main telescope, mean solar time, focal ratio, deep sky objects, star test, corrector plates, averted vision, equatorial mount, setting circles, exit pupil, primary mirror, sidereal time, light grasp, secondary mirror, celestial equator, choosing equipment, diffraction rings, tube currents, sky brightness, hour angle, polar axis, limiting magnitude
Key Phrases - Capitalized Phrases (CAPs):
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Choosing Equipment, Mean Solar Time, Getting the Best, Equation of Time
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