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SECOND. A measure equal to one sixtieth part of a minute. Vide Measure. 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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The 4-meter primary mirror would see an area 500 seconds of arc across centered on the pole. So this component allows us to operate with an attitude control system that has a pointing capability of a few seconds of arc, whereas the images will be stabilized to better than one tenth of an arc second. The two images lie 157 seconds of arc apart on the sky, and to Edwin L. |
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seconds of arc
