latitude and longitude
日期变更线为东的经线都称为西经纬度,纬线(latitude)我们通常说的纬
wikimedia.org/wiki/file:latitude_and_longitude_of_the_earth.svg
con(f.collapse('mean','longitude'), ylog=true)f=cf.
的质心,x轴延伸通过本初子午线(0度经度)和赤道(0deglatitude)的交点
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