

Related Terms 
ANGLE OF PRESSUREThe angle between the profile of a gear tooth and a radial line at its pitch point. Also known as angle of obliquity. 
TRANSVERSE RHUMB LINEA line making the same oblique angle with all fictitious meridians of a transverse Mercator map projection. Trans verse parallels and meridians may be considered special cases of the transverse rhumb line. Also called INVERSE RHUMB LINE. 
COORDINATEOne of a set of magnitudes defining a point in space. If the point is known to be on a given line, only one coordinate is needed; if on a surface, two are required; if in space, three. Cartesian coordinates define a point relative to two intersecting lines, called AXES. If the axes are perpendicular, the coordinates are rectangular; if not perpendicular, they are oblique coordinates. A three dimensional system of Cartesian coordinates is called space coordinates. Polar coordinates define a point by its distance and direction from a fixed point called the POLE. Direction is given as the angle between a reference radius vector and a radius vector to the point. If three dimensions are involved, two angles are used to locate the radius vector. Spacepolar coordinates define a point on the surface of a sphere by (1) its distance from a fixed point at the center, called the POLE (2) the COLATITUDE or angle between the POLAR AXIS (a reference line through the pole) and the RADIUS VECTOR (a straight line connecting the pole and the point) and (3) the LONGITUDE or angle between a reference plane through the polar axis and a plane through the radius vector and the polar axis. Spherical coordinates define a point on a sphere or spheroid by its angular distances from a primary great circle and from a reference secondary great circle. Geographical or terrestrial coordinates define a point on the surface of the earth. Celestial coordinates define a point on the celestial sphere. The horizon, celestial equator and the ecliptic systems of celestial coordinates are based on the celestial horizon, celestial equator, and the ecliptic, respectively, as the primary great circle. 
FREEFLIGHT ANGLEThe angle between the horizontal and a line in the direction of motion of a flying body, especially a rocket, at the beginning of free flight. 
FICTITIOUS RHUMB LINEA line making the same oblique angle with all fictitious meridians. It may be called transverse, oblique, or grid rhumb line depending upon the type of fictitious meridian. The expression OBLIQUE RHUMB LINE applies also to any rhumb line, real or fictitious, which makes an oblique angle with its meridians; as distinguished from parallels and meridians real or fictitious, which may be consider special cases of the rhumb line. Also called FICTITIOUS RHUMB, FICTITIOUS LOXODROME, FICTI TIOUS LOXODROMIC CURVE. 
FIXEDNEEDLE TRAVERSEIn surveying, a traverse with a compass fitted with a sight line which can be moved above a graduated horizontal circle, so that the azimuth angle can be read, as with a theodolite. 
APERTURE

AXIAL RAKEThe angle between the face of a blade of a milling cutter or reamer and a line parallel to its axis of rotation. 
GEOMETRICAL DIPThe vertical angle between the horizontal and a straight line tangent to the surface of the earth. It is larger than DIP by the amount of terrestrial refraction. 
ANOMALY

MarineProHelp 2018  2020