偏へん角かく

noun

declination; angle of deviation

General term for an angular deviation from a reference direction, used in navigation, astronomy, and engineering.

• 磁じ北ほくと真ま北きたの間あいだの偏へん角かくを考こう慮りょする必ひつ要ようがある。

  It is necessary to take into account the declination between magnetic north and true north.

noun

argument (of a complex number)

Mathematical term for the angle between the positive real axis and the line from the origin to a complex number in the complex plane.

• 複ふく素そ数すう z = 1 + i の偏へん角かくは π/4 です。

  The argument of the complex number z = 1 + i is π/4.