这张北极拼接图是由美国航太总署阿卡(Aqua)卫星的中分辨率成像光谱仪(MODIS)于2010年6月28日经过几个来回的扫描所构成的。
This Arctic Mosaic is composed from several passes of the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite on June 28, 2010.
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。
The earliest instrument for determining latitude was the quadrant, which measured the altitude of the polestar or the noonday sun.
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