The earliest instrument for determining latitude was the quadrant, which measured the altitude of the polestar or the noonday sun.

早期测定纬度的仪器是象限仪，测量北极星或正午太阳的高度。

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ALTIMETER - instrument that measures altitude.

高度表—高度测量仪器。

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An instrument for determining elevation, especially an aneroid barometer used in aircraft that senses pressure changes accompanying changes in altitude.

测高仪，高度计一种测量高度的仪器，尤指飞机中的无。

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The probe entered a special low-altitude orbit for about five months to allow the GRAND instrument to analyze emissions from Vesta's surface that result from collisions between cosmic ray particles and elements in the asteroid's dirt.

MSN: Surprisingly, giant asteroid Vesta covered in hydrogen