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polar diamotor-Tha dmnvster of the Earth
between the poles.
MIL-HDBK-850
polar dlstanoa-ltrrgular distance from a
ceisatiml pole; the arc of an hour circle between
e os4eatisl pele, usually the atavatsd pole, arrd a
point on Iha oefeetial @am, maasumd fmm
the cslastisl @s though ltW. Ses also
codecllrmtlon.
Polsr grtd+l grid system utifizod for aerial
nsvigstiin bt tha pofar regbns. It cOnsi@s of a
r@CISIWdW grid wfth X- end y-axes aligned with
tha W—lSO” and the 90”E-sooW msridians
respectively. When plotted on a tmmvarea
Mat’cater map pmjactkxr of the pebr ragions, ff
represents a system of transversal nraridiins
ard persUats whoes plea era at the
intersections of the Equator errd the 0“—1 80”
meridian.
II polar map projection-A map pmjacfion
wnlered on * pole,
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polar motion-Sea wwlation of the pole.
polar orbit-An Earth satelfiie orbit thst has
an incfinsticm of about 90” and, harm, passes
over tha Earth’s poles.
polar orthographic map projection-A
-P P(@*ti hs~ing the plane of the
propctm parpandculsr to the axis of rotation of
the Earth fpsrallel with the pfana d !he
Equator); in this pmjaction, the geographic
psrsllals era full circles, true to smle, arrd the
gsogrsphii maridiins am straight lima.
polar planimeter-An instrument wad in
rnaaauring eraas fmm a drawing. The
instrument rota!as about e pla, harce its
nama.
polar mdius-l%a mdiua of the Earth
maasurad abng Its axis of mfatiin.
polar Satelltte-fmy sstelfiie thal passes over
the north arxf south pales ef the Earth: i.e., one
that has an incfimstion of about 9W with respscf
to the EartNs Equator.
polar ●tarsogmphlc mep projection- A
stereographic pmjactiort having the center of the
projsdkan bcetad et a pofa of ths sphere.
Polarls correction-A correction to be
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eppfied to the observed Sltiilxie of PolSris 10
*sin the Iatitda.
Polarls-Tha aacsmd-msgnituds dsr, Alpha, in
the oomsteltatibrr Ursa Mii (Littte -r). Abo
celled Nofih Stm polestar.
polarlsstion flftar-Any of the manufactured
plestii tbars Wfictr plane pelsrizes Ordinery fiiht
when i passes tfrougfr the fi~er. Ueuefly
idetrtifii ty e trade rumta.
polarl~tlo~optics) Ths act or pmcaas
modfyrng tfght in such ● way that ths vkwatii
ara restrktsd to ● eingle plane, Acourdhg to the
wave theory, ordinmy (urpotarised) fiihf vibrstee
In all planes perpandicutsr to the drdort of
PmP8!@~0n. On passing thrwgh or contacting
a#aru.m9nww4urn (==h=PokmXd ora Katr
call) erdinsry tight becomes plane polstfzsd, that
is, its vibrations am fiisd to a single plans,
pcdastrodlat-A machenkal counter for
determining the azimtnh and altitude of Polaris
M eny time.
pole of the Milky Way-The pole in the
galactic system of coordinates,
pOl-st=r—See Polaris.
pole-1. Either of the two points of intersection
of the surfece of a ~here or spheroid and ifs
axis. 2. The origin of e system of polar
coordinates. See alse ●verage terrestrial
pole: cehsstlal pole; doprossed pola;
ecliptic pols; slevatsd pole; flctltlous
pole; galactlc pols; gaomsgrmtlc polo;
magnetic pole; north geographical pole;
north geomagnetic POIS; north magnetic
polo; oblique PoI*; south geogrsphlos)
pola; south geomagnetic polo; ●outh
magnstlc polo; torrsstrlal polo:
transverse pole.
polhody-A chart depicting the motion of the
terrastr”ml pole as a function of tires. See also
varlatlon of the poles.
polyart-A plastic based printing substrate with
excellent wet strength.
polychromo- See multicolor.
polyconk chart-A chart on the polyconic
map projection.