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sky compass |
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sky compass [′skī ‚käm·pəs] (navigation) A type of astro compass, designed for use in the Arctic during long periods of twilight, which utilizes the polarization of sunlight in the sky; it operates whenever the zenith is clear whether or not the sun is visible; when the sun is more than 6.5° below or 10° above the horizon, readings are uncertain. 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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