内部调用（对 ST_Point()）创建一个具有纬度-经度坐标（SRID =1）的点几何值。
The inner call, to ST_Point(), creates a point geometry with latitude-longitude coordinates (SRID = 1).
测量纬度，是同学们发挥空间想象力，运用所学的天文地理，平面几何和三角函数知识来解决问题的一次演练。
Measuring latitude creates the opportunity to truely use problem solving skills, utilize students'spatial imagination and knowledge from astronomy, geography, geometry and trigonometry.
并从几何、成像原理加以论证，证明了利用感光迹线检查暗筒式日照计方位、水平、纬度安装正确与否，隔光板构造是否精确是可行的。
It is feasible to inspect the azimuth, level and latitude of the dark-tube sunshine recorder, as well as to inspect whether the installation i…
并从几何、成像原理加以论证，证明了利用感光迹线检查暗筒式日照计方位、水平、纬度安装正确与否，隔光板构造是否精确是可行的。
It is feasible to inspect the azimuth, level and latitude of the dark-tube sunshine recorder, as well as to inspect whether the installation i…
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