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A great circle of the celestial sphere passing through the celestial poles and a celestial body or the vernal equinox. An hour circle moves with the body as the celestial sphere rotates, unlike the celestial meridian of a point that remains fixed.

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Kalbos dalis: noun
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Pramonės šaka / sritis: Astronomy
Category: Mars
Company: NASA
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Pramonės šaka / sritis: Aerospace Category: Space flight

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A reusable spacecraft with wings developed by the U.S. National Aeronautics and Space Administration (NASA) for human spaceflight missions. The first ...