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.
然而，他们认为在辨识经度上磁场帮不上忙，所以海龟如何分辨东西方位仍然是个谜。
But they believed the magnetism to be of little use in judging longitude, leaving it a mystery as to how the turtles know their east from west.
红海龟可以通过地球磁场强度来辨识纬度。新的研究发现，借助地球磁场方向，它们在辨识自己所在的经度上也很在行。
Loggerhead turtles sense latitude by the planet's magnetic field intensity, and new research finds they're good at determining their longitude too, probably via the field's inclination.
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