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equatorial mounting |
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equatorial mounting n (Physics / General Physics) an astronomical telescope mounting that allows motion of the telescope about two mutually perpendicular axes, one of which is parallel to the earth's 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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