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).
这可从小时经度上测量，都是通过基本几何角度来确定趋势的变化。
These are measured in hours of longitude, which are basic geometric angles and determine the changes in trend.
这可从小时经度上测量，都是通过基本几何角度来确定趋势的变化。
These are measured in hours of longitude, which are basic geometric angles and determine the changes in trend.
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