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equatorial mounting |
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equatorial mounting: see telescope telescope, traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; ..... Click the link for more information. . equatorial mounting [‚e·kwə′tȯr·ē·əl ′mau̇nt·iŋ] (engineering) The mounting of an equatorial telescope; it has two perpendicular axes, the polar axis (parallel to the earth's axis) that turns on fixed bearings, and the declination axis, supported by the polar axis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Usually optical telescopes have been hung in what is called an equatorial mounting, with one rotation axis parallel to the plane of the celestial equator and the other parallel to theline between the celestial north and south poles. However, the telescope has to be hung at an angle to the vertical, and in the case of an arrangement as bulky as the NNTT, an equatorial mounting would impose torques and shears that the system couldn't sustain. |
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