This paper describes the principle of computing map magnetic declinations, a new method of computing MMD is presented.
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。
The errors of the circle of a meridian circle will immediately affect the precision in determining celestial bodies' declinations.
刻度盘的误差，是子午环固有的仪器误差之一，它直接影响了天体赤纬的测定精度。
The relation between the error of nutation constant and the corrections of declinations, proper motions calculated by chain method is analysed, and the method to correct this effect is considered.
分析了章动常数误差与用连锁法计算的赤纬、自行改正之间的关系，并考虑了改正这种影响的方法。
According to the specified observation data, it found that the magnetic declinations on airdrome runway varied greatly; therefore, it couldn't reflect the real condition for the airdrome whole area.
机场运行需要跑道上的磁偏角，但本次实际观测数据表明，机场路道上的磁偏角因受机场环境影响，不同地方变化很大，不能反映机场整个区域的实际情况。
According to the specified observation data, it found that the magnetic declinations on airdrome runway varied greatly; therefore, it couldn't reflect the real condition for the airdrome whole area.
机场运行需要跑道上的磁偏角，但本次实际观测数据表明，机场路道上的磁偏角因受机场环境影响，不同地方变化很大，不能反映机场整个区域的实际情况。
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