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backstaff中文是什么意思

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用"backstaff"造句"backstaff"怎么读"backstaff" in a sentence

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  • 反向高度观测仪反向高度仪

百科解释

The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When observing the sun, users kept the sun to their back (hence the name) and observed the shadow cast by the upper vane on a horizon vane.
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