The angle that a magnetic needle makes with the horizontal plane at any specific location. Magnetic dip is 0° at the magnetic equator and 90° at each of the magnetic poles. Also called magnetic inclination磁倾角：在任一特定位置磁针与水平面成的角，在地磁赤道磁倾角为0度，在每一磁极为90度 也作 magnetic inclination