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dlUI’IISSl clrcla-The apparent datfy path of a
cefaaflaf body, appmxlmamrg a parallel of
declination.
Ukmrai conatltuent-Any tide conerituent
Wtroae parbd apprmximales that of a lunar day
(24.84 solar houffi). See also conatlruant.
MIL-HDBK-850
Sflurnal lnequsdfty-The difference In heighte
and dumtfons of the two successive high wafers
Or of lhe two aumessiva bw waters of aach day;
atm, the dfierarrca In spaed and dkactiin of tha
two fbod CUmWrfa or the two ebb currents of
each day. Also callad dally lnSqUallty;. low
water Inequality.
diurnal motion-The a~arent daily motion of
a celesflal body.
diurnal parallax—Ses geocentric
parallax.
cflurnal varlatlon-Thai component of a
determinable magniiude which passes through
a wmplete cycle in one day.
dlumel—Having a, period. of, occurring in, .or
related to a day.
dlvorgenca-(ieveiing) The difference
bafween ffia numerical values of fwo nmnings
over the same seclion of a line of levels,
dlvarglng lane—See negative Iana.
DMA Automated Publlcat/on ProductIon
Systam (DAPPS)-An electronic imaging
davica used to crea!e text and manipulate
graphic images. Output is either 10 a laser
printer or a phototypesetter.
dodging-(photograj?hy) Tfre process of
hotdlng back Ilght trom carlain areas of
senaftiied material to avoid overexpoaura of
thase areas.
domeatlc map-A map of an area within Ihe
timits 01 the United Stales.
dominant waveiangth-The wavelength of a
spectrally pure energy that if mixed with white
Sgfrl woufd match a color.
Doppler cone angla-The engle batween
the ratarence velocity vector and the refarence
range vactor.
Doppler eNect—(JCS) The phenomenon
evidenced by tha change In the obearvad
lraquency ot a sound or radii wave caused by a
time rata of charge in the affactive length of Ihe
path of travel bahvean the =urce and Ihe point
of obaervalbn. Also called Doppfar shltt.
Dopplar navigation—1. A system which
measures ground speed and drift of an airrxaff,
baaed on the Doppler affed Ot 6WfmnbSw
generated signals emhtast from the crafi frrxf
reflected from the Iarrain. 2. A system whbh
dalermirras posifiins basad on the Doppler
effacf o! aafellifa aignala. sea atao broadcaat
ephemeris; Doppfer sonar navlgatlon;
Navy Navlgatlon Satefllto System; point
posltlonfng; pracfaa ephemerla;
translocatlon.
Dopplar satolllfa survey ●yofam-A
receiver/antanna combrnatierr capabfe of
receiving signala broadcast by aateiliies Of the
Navy Navigation Salelllfe System (NNSS). The
position of the antenna is mmputad by Point
poallionlng, translocation, or shon arc geOd8fiC
adjustment (SAGA), ush?g the mllacfed signals
from the satellite passes.
Doppler ehltl—See Doppler effect.
Doppler sonar navigation-A syatam by
whch speed and drtfl of a marine craft are
determined horn the Doppler effect o! aoner
genaratad signals amitfad from fhe craft and
reflected from the ocean bottom or suspended
particulate in the aaawafer. Sea alao Doppler
navlgat(on; ●onar.
dot ecreen-A photographic negative
confalning equal-sized dots which are equally
spaced in parallel and perpendicular rows. The
prfmed area o! mverage determines the screen
percen!. The percentage of tha printed area of
mvarage IS measured by trrmemiaeion danaffy
andlor by dot diametar. Dot screens are uaad to
print tones of a mbr. Also called ffaf tlnf
acraan.
doubls optlcsl proJactlon r3tareoplotler—See
doubla-projection dlrectvlewlng
stareoplotter.
double burn-The Imentional expoaura of two
or more Ikra and/or hafffone negatfves In
auccasaion and ragistar on the same sanaitizad
aurtace. Not to be confused with doubla
exposure, which Is usually unintentional. Also
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