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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
Hα
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
photodisintegration
photodissociation
outer
photoeffect
photoelectric
photoelectric
absorption
photoelectric
bisecting device
photoelectric
cathode
photoelectric
cell