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2581 "P"

pacce
Cerro Pachon observatory
Publication of the Astronomical Society of the Pacific
Pac-
support pad
solar paddle
electron pair
star pair method
pair of movable wires
pair production
Palomar observatory
Palomar observatory sky survey
panchromatic
panchromatic emulsion
control panel
Panoptic eyepiece
panoramic receiver
recording paper
paper base
paper developer
fixed parabola
parabola corrector
parabolic
parabolic antenna
parabolic cylinder
parabolic mirror
parabolic orbit
parabolic primary
steerable parabolic reflector
parabolic (reflector) antenna
parabolic (reflector) radio telescope
parabolic telescope
parabolic velocity
steerable paraboloid
paraboloid(al) reflector
paraboloid bowl
paraboloid dish
paraboloid mirror
paraboloid radio telescope
cylindrical paraboloid reflector
paraboloid (reflector) antenna
Zeeliger's paradox
cosmological paradoxes
parahelium
parahydrogen
parallactic
parallactic angle
parallactic component
parallactic displacement
parallactic ellipse
parallactic error
parallactic head
parallactic inequality
parallactic libration
parallactic motion
parallactic mounting
parallactic shift
parallactic triangle
trigonometrical parallax
trigonometric parallax determination
trigonometric series of parallaxes
parallax factor
parallax in azimuth
parallax in declination
parallax in right ascension
parallax in zenith distance
parallax plates
parallax program(me)
parallax series
parallax star
parallax work
parallel
parallel band
parallel beam
parallel light
parallel vibration
paramagnetic resonance
induced paramagnetism
Hubble's parameter
Stokes' parameters
parametric
varactor (diode) parametric amplifier
Chandrasekhar's parametric equations of state
paramodification
Cerro Paranal observatory
parasitic antenna
parasitic image
paraxial rays
fractional parentage
parentage of spectral terms
parent comet
parent nucleus
parent term
parfocal eyepieces
parhelia
parhelion
parity
parity effect
parity rule
Parkes radio telescope
cubic parsec
moving parsecs
partial eclipse
partial exposure
partial filling
partially-filled aperture
partially polarized
partial phase
partial polarization
spiraling particle
charged particle counter
particle flux
particle loss
Particle Physics and Astronomy Research Council
β particles
particle scattering
particular act
vibrational partition function
partly filled aperture
Paschen-Back effect
Paschen continuum
Paschen limit
Paschen series
Pashen-Runge mounting
receiver band pass
time of perihelion passage
passage of meteor
passage through potential barrier
pass band
passband
passenger elevator
low pass filter
isoplanatic patch
air path
apparent path of the Moon
solar patrol
field pattern
pattern lobes
Pauli's exclusion principle
payload
payload weight
pa
pa
"pa"
pa
paea
P-branch
pc
P Cygni
P Cygni line profile
subsidiary peak
peak electron density
peak intensity
Sacramento peak observatory
peak radio emission intensity
peculiar
peculiar galaxy
peculiarity
peculiar motion
peculiar motion component
peculiar nebula
peculiar object
peculiar spectrum
peculiar star
peculiar velocity
Peltier cooler
pen(-and-ink) recorder
incident pencil
pencil beam
pencil-beam (aerial) system
pencil-beam antenna
pencil beam instrument
pencil beam interferometer
pencil beam scan
pencil of radiation
conical pendulum
pendulum clock
penetrating coefficient
penetrating component
penetrating orbit
penetration depth
pentad
pentag
penta-prism
spot penumbra
penumbral eclipse
per annum
per century
color perception
per day
perfect cosmological principle
perfect diffuser
perfect emitter
perfect gas
perfect gas law
perfect scattering
perfect seeing
theoretical performance
radio performances
per hour
periastron
perigee
perigee distance
perihelia
perihelic distance
argument of perihelion
perihelion distance
time of perihelion passage
motion of perihelion (point)
perihelion speed
periheliutn
lines per inch
synodic rotation period
long period comet
periodic chart
periodic comet
periodic error correction
periodic errors
periodicity period
periodic motion
periodic perturbation
periodic system of elements
periodic table
periodic variables
periodic variable stars
period-luminosity diagram
period-luminosity law
period-luminosity relation
period of overlap of two cycles
synodic period of rotation at the equator
period of solar rotation
period of variation
periodogram
period per second
peripheral vision
permanent current
permanent
permanent satellite
magnetic permeability
permeability of space
per minute
permitted line
permittivity of space
perpendicular antennas
perpendicular band
perpendicular vibration
per second
persistent lines
personal equation
personal error
perturb
perturbance
vibrational perturbation
perturbation method
stellar perturbations
wave-mechanical perturbation theory
perturbative effect
perturbative function
perturbed orbit
relativistic perturbing force
electron density per unit length
per year
p-fold symmetric axis
Pfund series
phantom telescope
phantom telescope computer
pharos
gibbous phase
phase angle
range of phase angles
sudden phase anomaly
phase changer
phase changing unit
phase coefficient
phase coherent mechanism
monthly phase cycle
phased array
Rayleigh's phase function
phase grating
phase integral
phase matrix
flash phase of flare
phase of planet
maximum phase of solar cycle
phase of the Moon
phase plate
phase reversing switch
phase rotator
phase rule
phase sensitive detector
phase-sensitive detector
phase-sensitive rectifier
phase shifter
phase-shift method
phases of Venus
phase space
phase spectrum
phase switched interferometer
phase-switched interferometer
phase switching
phase-switching interferometer
phase-switching method
phase-switching principle
phase-switching receiver
phase-switching technique
phase-switching unit
phase variation
phase velocity
phenidone developer
terrestrial phenomena
seeing phenomenon
phonon
potassium dihydrogen phosphat
phoswich detector
phot
photo
photoactivate
photoactive
photoamplifier
photo-cathode
opaque photocathode
vacuum photocell
photocell box
photochromy
photochronograph
photoconducting cell
photoconduction
photoconductive
photoconductive cell
photoconductive effect
photoconductivity
photoconductor
photocurrent
photocurrent noise
photodetachment
photodetector
avalanche photo-diode
p-i-n photodiode