To navigate, birds rely on a variety of internal, which are calibrated to Earth's geomagnetic fields by sunlight, starlight and moonlight.
鸟类的导向依赖于其自身内部的导向系统，可根据阳光，月光和星光校正至地球磁场。
The first is the creation of new magnetic fields from the ambient geomagnetic field.
第一个过程是在周围地磁场的基础上产生新磁场。
The measurement of horizontal component of the geomagnetic field occupies the important position in a lot of fields.
地磁场水平分量的测量在很多领域占重要地位。
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