Radial triangulation performed by computational routines in which nadir points are utilized as radial centers.

Related Terms

NADIR

The point on the celestial sphere vertically below the observer, or 180° from the zenith.

LOWER BRANCH

The half of a meridian or celestial meridian from pole to pole which passes through the antipode or nadir of a place.

AZIMUTH TRANSFER

Connecting, with a straight line, the nadir points of two vertical photographs selected from overlapping flights.

LONGITUDINAL FLOW REACTOR

Theoretical reactor system in which there is no longitudinal mixing (back mixing) of reactants and products as they flow through the reactor, but in which there is complete radial (side-to-side) mixing.

HORIZONTAL LATHE

A horizontally mounted lathe with which longitudinal and radial movements are applied to a workpiece that rotates.

ANNULAR BEARING

Usually a rolling bearing of short cylindrical form supporting a shaft carrying a radial load.

TAPERED-LAND THRUST BEARING

The babbitt face of a tapered-land thrust bearing has a series of fixed pads divided by radial slots. The leading edge of each sector is tapered, allowing an oil wedge to build up and carry the thrust between the collar and pad.

ANOMALISTIC MONTH

The average period of revolution of the moon from perigee to perigee, a period of 27 days, 13 hours, 18 minutes, and 33.2 seconds in 1900. The secular variation does not exceed a few hundredths of a second per century. anomalistic period. The interval between two successive passes of a satellite through perigee. Also called PERIGEE-TO-PERIGEE PERIOD RADIAL PERIOD. See also ORBITAL PERIOD.

BEARING CURSOR

The radial line on a radar set inscribed on a transparent disk which can be rotated manually about an axis coincident with the center of the PPI. It is used for bearing determination. Also called MECHANICAL BEARING CURSOR.

COORDINATE PAPER

Paper ruled with lines to aid in the plotting of coordinates. In its most common form, it has two sets of parallel lines, usually at right angles to each other, when it is also called CROSS- SECTION PAPER. A type ruled with two sets of mutually-perpendicular, parallel lines spaced according to the logarithms of consec- utive numbers is called logarithmic coordinate papa or semilogarithmic coordinate paper as both or only one set of lines is spaced logarithmically. A type ruled with concentric circles and radial lines from the common center is called polar coordinate paper. Also called GRAPH PAPER.

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