1 - NGA

MIL-HDBK-850
rovolutlon-1. The turning cd a body akruf an
exterior pdnf or Sxis. l-ha ~ dmindii
betwaen mvdutkm mxi m4atii is given m the
stetsrmanf Wra Eatih revolves around the Sun,
and rotstes on its ssis.” 2. (mmwying) A turning
of an indrumant or part Of an klStNMSld.
rhomboidal prfam-A prism thet displecee
the esis of the beam of Iiihf only Iefarelly.
rhumb b.arfng-1%.s direction of a rhumb fiie
through fwu terrestrial points, axpessad es
angdsr distance from a reference diracticm If is
ususlly massurad fmm 0° et the referents
dkacf”mn cbckwiaa to 3S0”. Also celled
Mercator boerlng.
rhumb dlr.otiort-sea Meraator diraation.
rhumb Ilno dlstanca-Dtskance alerm a
rhumb line, ususlly exprassad in nsutical miles.
rhurnb llrre-A line on the surface of the Earth
cutting all meridians at Ihe same angle. [A
Ioxcdrome or Ioxcdmmic curve spiraling toward
the poles in e mrrsten! true dkct”mn. Pmelbls
ard maridisns, whiih elm msintairrcxrrrstsm L,
true dhctiona, msy be considered spac”ml 0ssss
of Ihe rhunrb line, A rhumb line is a straight line
on e Mercator projection.] Also csllad
equim’rgular eplral: Ioxodromo:
Ioxodromlc curva; Marcator track.
ridge llno-A grephk representation cd mejer
*I36 u* to gtie more definition to the
Iepographw character of an ares for the
determination of low rdtiiurle rsdar prsdktions.
They are shown onty in areas of rise grediant to
depict those plscae in vhich the elevated terrein
femrs a sufficient background to pwlislly screen
visien at low altitude.
right ascmmion systmn-An equatorial
system d curvilinear celaetLel ceordineles wtrkh
hss the Equator es the prknery ra4ererce ptsna
and the pxypmdwlar hour circle through the
vend aqumox as the samndary refereme
plane. The direction to a bedy is given by ifs
right ascension and declination,
rfght asconslor+l%e angulsr distance
meesurad esafward on the Equator from the
vemrd equines to the hour circle through the
celestial bcdy, frem O to 24 Imura.
right bank—Thet benk of a stream or river on
ths right of he oLrserver when ha ia facing in the
220
duadion of fbw, or dewnstraam.
rlgM ●WO-Ttr@ cdeatisl sphere es &
~,m tO ~ observer at the E@or, tire
celestial balms rqpeer to rise verticality nbove
the herizon.
rfght-mrglo primn-A @ thel turns a baem
d Iiihf through a right engla. It irwarts (turrvs
@e down) or reverts (tuma rigid for left)
mxading to the csier$stii of the piism.
right-roadlng-A descriptive term for cm
imege which, when viawxl through the bese,
reeds the esme es the original, Other terms
sometimes used to identify image dimcfien,
such aa normel madlrrg, natural
readings, etc., are not recommended
bacauca of possible cod- k-l nagalivepcdive
ralationehip.
rlgld tripod ●ngrsver-A scribing instrument
with three @nls of mrrtscl surface, to ~rb
the normal irrbelance of the qeretofs Imrrd
pressure.
ring—(digitel mepp4ng) An edge which is a
memtmr d.e-dtierant closed hep of edges,
risa gradient—A color-ceded omnidirsdional
grsphic representation of those terrain sbpes
which are predicted to be low altitude redsr
significant.
rlae tkna-The timo at wh~h a seteltifa’s
brmdcesf cen be picked up by e auifebfy
equipped cbssrver, as fokan from an elert. Set
lime and time of cfoaosf approach are elso
given. Sss also ●lerts; rlao.
rlsa-1. To cross the visibla horixon while
ascending. 2. (sstelliie suweying) To cmsa the
obaowets herfzon while ascending; demcteble
by bmadcest dela mcahmd.
rltrlng tide-See flood tide.
rlvar cmsslng-(laveling) Carrying a Iirrs of
levels across e atresm or other body of water,
when ne sultsble bridge k aveilsbla and the
width of the Lmdy of weter is gmster than the
maximum ellowsble length of sight for the
leveling, requires a special serias of
cbssrvetions tibh taken mllecridy is known
es a river cmaeing.
rhrerlne nrea—(JCS) An inland or coastal area