1 - NGA

I
pondlng Image rays.
,,. . MIL-HDBK-B50
cofrjtxgate ~lrrte-The oblecf and Image
poims in an optical system. They are physically
retetad according to the definition for
conjugate dlstencee.
cortjunctiorx-llte alfuefion of two celestial
bodies havhtg the same celestial longitude or
the eerrw sidereal hour angle. See eleo Irrferlor
conjuncilon: opposttton; euperlor
conjunction.
corrnectlng travairea-A traveme which efada
and ends et separate ~ints whose relative
positions have been determined by a survey ot
an atpmi- or higher-order ot accuracy.
@n8Meff@ lees eubjecf 10 undelecfad error
than a bop traverse,
connection-(geodesy) The systematic
elimination of discrepancies behveen adjoining
or overfspplrrg trian@ation networks for the
purpose of establishing a common framework
from whkh bng-renge measurements can
betaken.
connectlvlt y rinslysle-1. Analytical
technique 10 dalermine whether a set of peirrts
(nodes) or lines are rnnnecked to each other.
2. (GIS) Function used to predict or track
ruutings through a nslwrxrk.
conaecutlva mersrt-A arnoothed
represenfatkm of a time series derived by
replacing each obsewed value with a mean
value Cmrqxrfed over e 6electad imerval.
Consecutive means are used in smooming to
atimlnate unwarned psrfocficitles or minlmlze
irregular variations. Aiso called moving
averege; overlapping meen; runntng
mean.
Consol chert-A chart showlrrg Consol lines of
position.
Coneot-(.fCS) A brrg-range redo aid 10
navigation, the emissions of which, by means of
Iheir radio traquency rnodulatiin characferisfba,
enable bearings to be determined.
conatent ●rror-A systematic error which is
the 6ams in both rnagnltude and s!gn
throughout a given eeria6 of observations, such
aa an Indax error of an instrument, See also
accumulative error.
conatent of abarratlon—The maximum
aberration of a star obeawed from the surface of
52
the Earfh, 20.496 seconds of arc.
conetant of gravitation-The ropottbnallfy
taclor (equal to 6.67 X 10-5 rr$kd sac+) in
the universal law of gM*tiOn; i.e., every
panicle of matter attracts every other pertWs
with a force mat k directly pmportbnel to the
product of their masses and Inversely
prmporfbnal to the square of their dietarme
apart. Also called gravitational Conetant;
law of unlvertxal gravitation.
constant pressure chert-see Iaoberlc
chart.
conetellatlon-lm orbital group of Q3tellifas,
e.g., Iha Global Posltbning Syslem(GPS).
conetltuent day-The duration of the Earth’s
daily rotation relafiie 10 a ficffilous efer Mrich
reprasants one of the perbcfk fiie-pmducirtg
forces; it approximates the length of the funar or
solar day and corresponds to the period of a
diurnal constituem of twke the period of a
semidiurnal constituent. The term is rot
applicable to the iong-perbd conetffuams.
constltuant-ne ot the harmonic elements
in a mathematical expre66ion for the tide- . . .
producing force and in the cvrretpnding
iormulas Ior the I’de or tidal current. Each
censtituenf represents a periodic change or
variation in the reieiive positions of the Earth,
Moon, and Sun. Also called aetronomlc tldel
constituent; harmortlc constituent;
partlel tide; tlsfal constituent. See also
component; diurnal conetltuent:
xsemldlurnal conetituarrt.
contect berse-llne rneaeurlng
aPParatua—A base apparatus composed of
bars whose lengths are defined by the disfarce
between their end faces or points. M use, the
bam are laid end to end, one bar balng kept In
pesition while another bar is bairrg rnovad
ahead,
contect glaea—See focal plane plate.
contect pleta-See focal plsne plata.
contact printer—A device which provides a
light eource and a means for hotding the
negetlve and the senaifive meteriai in WntaCf
during exposure. Also, a spaclallzed device for
exposin~ diapxifive plates at the same scale aa
that of the negaflve.