地球表面任一点的磁子午圈同地理子午圈的夹角。因指南针、磁罗盘是测定磁偏角最简单的装置，所以磁偏角的发现和测定的历史也很早。
给出当地方向的确定方法和地磁偏角的近似计算式，澄清了接收天线极化波容易造成的误解。
We also show how to get a local orientation and an approximate formula for geomagnetic declination. Our work clarifies the misconception about polarized wave of antenna.
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。
The magnetic declination of palaeomagnetic mean directions of the Bohemian Massif and that of Inner Sudetie Basin of Late Carboniferous Epoc differed 17 degrees.
详细论述了磁偏角自动计算的原理，并提出了一种利用地磁图自动计算图幅磁偏角的新方法。
This paper describes the principle of computing map magnetic declinations, a new method of computing MMD is presented.
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