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A vertical is a region that intersects with the celestial sphere by means of a vertical plane that passes through its center, zenith, and nadir.
Vertical
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A vertical is a region that intersects with the celestial sphere by means of a vertical plane that passes through its center, zenith, and nadir.
Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.