Chinese English

The horizontal DIRECTION of one terrestrial point from another, expressed as the ANGULAR DISTANCE from a REFERENCE DIRECTION. It is usually measured from 0° at the REFERENCE DIRECTION clockwise through 360°. The terms bearing and AZIMUTH are sometimes used interchangeably, but in NAVIGATION the former customarily applies to terrestrial objects and the latter to the DIRECTION of a point on the CELESTIAL SPHERE from a point on the EARTH. A bearing is designated as true, MAGNETIC, or compass as the REFERENCE DIRECTION is TRUE, MAGNETIC, or COMPASS NORTH.

指地面一点至另一点的水平方向，表示为自基准方向起算的角距离。通常自基准方位向的0°开始按顺时针方向测量至360°方位和方位角。方位和方位角有时可以互用，但在航海上，前者习惯应用于地面物体，后者习惯于指地球上的点至天球上的点的方向。当方位以真北、磁北或罗经北为基准方向时，则分别称为真方位、磁方位或罗经方位。 

The initial DIRECTION of a GREAT CIRCLE through two terrestrial points, expressed as ANGULAR DISTANCE from a REFERENCE DIRECTION. BEARINGS obtained by any form of RADIANT ENERGY are great-circle bearings.

In a system of POLAR or SPHERICAL COORDINATES, the angle formed by the intersection of the reference MERIDIONAL PLANE and the MERIDIONAL PLANE containing the point.

The angle between the apparent direction of a definite source of emission of ELECTRO-MAGNETIC WAVES and a REFERENCE DIRECTION, as determined at a RADIO DIRECTION-FINDING STATION.

The direction of a RHUMB LINE through two terrestrial points expressed as ANGULAR DISTANCE from a REFERENCE DIRECTION. Also called mercatorial (or mercator) bearing.

指地面一点至另一点的水平方向，表示为自基准方向起算的角距离。通常自基准方位向的0°开始按顺时针方向测量至360°。方位和方位角这两个术语有时可以互用，但在航海上，前者习惯于指地面物标的方位，后者习惯于指地球上的点至天球上点的方向。当方位以真北、磁北或罗经北纬基准方向时，则分别称为真方位、磁方位或罗经方位。

A ring designed to fit snugly over a COMPASS or COMPASS REPEATER, and provided with VANES for observing BEARINGS. A similar ring provided with means for observing AZIMUTH of the SUN is called an azimuth circle.