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1077 "P"

• pacce
• pad
• pair
• pair of movable wires
• pair production
• Palomar observatory
• Palomar observatory sky survey
• panchromatic
• panchromatic emulsion
• panel
• Panoptic eyepiece
• panoramic receiver
• paper
• paper base
• paper developer
• parabola
• parabola corrector
• parabolic
• parabolic antenna
• parabolic cylinder
• parabolic mirror
• parabolic orbit
• parabolic primary
• parabolic radio telescope
• parabolic reflector
• parabolic reflector antenna
• parabolic reflector radio telescope
• parabolic telescope
• parabolic velocity
• paraboloid
• paraboloidal reflector
• paraboloid antenna
• paraboloid bowl
• paraboloid dish
• paraboloid mirror
• paraboloid radio telescope
• paraboloid reflector
• paraboloid reflector antenna
• paradox
• 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
• parallax
• parallax determination
• parallax factor
• parallax in azimuth
• parallax in declination
• parallax in right ascension
• parallax in zenith distance
• parallax plates
• parallax program
• parallax programme
• parallax series
• parallax star
• parallax work
• parallel
• parallel band
• parallel beam
• parallel light
• parallel vibration
• paramagnetic resonance
• paramagnetism
• parameter
• parametric
• parametric amplifier
• paramodification
• parasitic antenna
• parasitic image
• paraxial rays
• parentage
• parentage of spectral terms
• parent comet
• parent nucleus
• parent term
• parfocal eyepieces
• parhelia
• parhelion
• parity
• parity effect
• parity rule
• Parkes radio telescope
• parsec
• partial eclipse
• partial exposure
• partial filling
• partially-filled aperture
• partially polarized
• partial phase
• partial polarization
• particle
• particle flux
• particle loss
• Particle Physics and Astronomy Research Council
• particle scattering
• particular act
• partition function
• partly filled aperture
• Paschen-Back effect
• Paschen continuum
• Paschen limit
• Paschen series
• Pashen-Runge mounting
• passage
• passage of meteor
• passage through potential barrier
• passband
• pass band
• passenger elevator
• path
• patrol
• pattern
• pattern lobes
• Pauli's exclusion principle
• payload
• payload weight
• pa
• pa
• paea
• P-branch
• pc
• P Cygni line profile
• peak
• peak electron density
• peak intensity
• 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
• pencil
• pencil beam
• pencil-beam aerial system
• pencil-beam antenna
• pencil beam instrument
• pencil beam interferometer
• pencil beam scan
• pencil-beam system
• pencil of radiation
• pendulum
• pendulum clock
• penetrating coefficient
• penetrating component
• penetrating orbit
• penetration depth
• pen recorder
• pentad
• pentag
• penta-prism
• penumbra
• penumbral eclipse
• per annum
• per century
• perception
• per day
• perfect cosmological principle
• perfect diffuser
• perfect emitter
• perfect gas
• perfect gas law
• perfect scattering
• perfect seeing
• performance
• per hour
• periastron
• perigee
• perigee distance
• perihelia
• perihelic distance
• perihelion
• perihelion distance
• perihelion passage
• perihelion speed
• periheliutn
• period
• 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
• period of solar rotation
• period of variation
• periodogram
• period per second
• peripheral vision
• permanent current
• permanent Hα
• permanent satellite
• 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
• perturbation
• perturbation method
• perturbative effect
• perturbative function
• perturbed orbit
• perturbing force
• per year
• p-fold symmetric axis
• Pfund series
• phantom telescope
• phantom telescope computer
• pharos
• phase
• phase angle
• phase changer
• phase changing unit
• phase coefficient
• phase coherent mechanism
• phased array
• phase function
• phase grating
• phase integral
• phase matrix
• phase of planet
• phase of the Moon
• phase plate
• phase reversing switch
• phase rotator
• phase rule
• phase sensitive detector
• phase-sensitive detector
•&nb