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Meridian telescopes rely on the rotation of the sky to bring objects into their field of view and are mounted on a fixed, horizontal, east–west axis. The similar transit instrument , transit circle , or transit telescope is likewise mounted on a horizontal axis, but the axis need not be fixed in the east–west direction.
The observatory is named for Vera Rubin, an American astronomer who pioneered discoveries about galactic rotation rates. The Rubin Observatory will house the Simonyi Survey Telescope, [14] a wide-field reflecting telescope with an 8.4-meter primary mirror [9] [10] that will photograph the entire available sky every few nights. [15]
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Since the Earth is constantly rotating, telescopes and equipment are rotated in the opposite direction to follow the apparent motion of the stars overhead (called diurnal motion). This is accomplished by using either equatorial or computer-controlled altazimuth telescope mounts to keep celestial objects centered while Earth rotates.
He left there in 1977 to become a freelance illustrator and author; to date he has nearly sixty book titles to his credit, and his illustrations have appeared on hundreds of book jackets, book interiors and in magazines such as National Geographic, Reader's Digest, Scientific American, [3] Smithsonian, Analog, Starlog, Air & Space, Astronomy ...