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1·On the Earth's surface where the magnetic declination is zero.

一条在地球表面上连接磁偏为零的点的假想线。

2·The magnetic declination of palaeomagnetic mean directions of the Bohemian Massif and that of Inner Sudetie Basin of Late Carboniferous Epoc differed 17 degrees.

波希米亚地块与内苏台德盆地地区晚石炭纪古地磁平均方向的磁偏角相差17度。