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I
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J
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K
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L
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M
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N
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P
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Q
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R
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2578 "R"
()
R
R,
Racah's
method
gear
rack
rack-and-pinion
rack
and pinion focuser
to
rack
out
synthetic aperture
radar
radar
antenna
radar
astronomy
radar
beam
radar
cross section
radar
cross-section
radar
data
radar
depth
radar
distance
radar
echo
radar
(echo) work
standard
radar
equation
radar
equipment
radar
experiment
radar
investigation
radar
measurements
radar
method
radar
observations
radar
observations of solar system
radar
pulse
radar
receiver
radar
reflection
radar
reflector
radar
results
radar
set
radar
signal
radar
station
radar
study
radar
system
radar
target
radar
technique
Venus
radar
work
Radcliffe
observatory
radial
acceleration
radial
current
radial
girder
radial
knife-edges
radial
magnetic field
radial
motion
radial
optical thickness
radial
oscillation
radial
quantum number
radial
truss
radial
velocimeter
radial
velocity
radial
velocity relative to the Sun
radial
velocity spectrometer
radian
radiance
meteor
radiant
radiant
emittance
radiant
energy
radiant
energy density
radiant
flux
radiant
intensity
radiant
of shower
radiant
power
delineation of meteor
radiants
power
radiated
by source
radiated
energy
radiating
components
radiating
element
radiating
region
radiating
surface
synchrotron
radiation
radiation
absorption
radiation
belt
radiation
capacity
radiation
coefficient
radiation
counter
radiation
damping
radiation
density
radiation
effect
radiation
energy
stellar
radiation
field
radiation
flux
radiation
frequency
noise
radiation
from antenna
noise
radiation
from atmosphere
noise
radiation
from radiometer
radiation
from the earth
radiation
from the whole Sun
radiation
hazard
thermal
radiation
in infrared
radiation
intensity
Planck's
radiation
law
radiationless
quantum jump
radiationless
transfer
radiationless
transition
radiationless
transition probability
radiation
level
solar
radiation
pressure
radiation
receiver
radiation
resistance
radiation
scattering
radiation
sickness
radiation
temperature
radiation
theory
outer
radiation
zone
radiation
zones
radiative
envelope
radiative
equilibrium
radiative
excitation
radiative
flow of energy
radiative
flux
radiative
process
radiative
recombination
radiative
transfer
selective
radiator
hydroxyl
radical
inorganic
radicals
radii
radioactive
decay
radioactive
disintegration
radioactive
element
radioactive
heating
radio
angular diameter
radio
astronomer
Instituto di
Radioastronomia
radio-astronomical
radio
astronomical explorations
radio(astronomical)
instruments
radio
astronomical method
radio(-astronomical)
observations
radio(-astronomical)
observatory
radio(-astronomical)
research
radio
astronomical station
radio(astronomical)
studies
radio
(astronomical) work
Institut de
radio
astronomie millimetrique
instrumentation for
radio
astronomy
radio
astronomy allocation
radio-astronomy
frequencies
Nuffield
Radio
Astronomy Laboratory
radio
astronomy method
Mullard
Radio
Astronomy Observatory
radio-astronomy
radiometer
radio
astronomy receiver
radio
astronomy technique
Dominion
radio
astrophysical observatory
National Center for
Radio
Astrophysics
map of
radio
brightness
radio
brightness distribution
radio-brightness
temperature
radio
brightness temperature distribution
type V
(radio)
burst
solar
radio
burst
radio
components
radio
condensation
radio
continuum
radio
corona
radio
cosmology
radio
data
radio
detection
brightness distribution of
radio
disk
radio
disk temperature
radio
disturbance
radio
Doppler effect
radio
echo
radio
echo apparatus
radio
echo duration
radio
echoing power
radio-echo
measurements
radio-echo
meteor
radio-echo
method
radio
echo studies
radio
echo technique
radio
eclipse
ratio of optical to
radio
emission
radio
emission characteristics
radio
emission diameter
radio
emission from flares
radio
emission from galaxies
radio
emission from space
radio
emission from stars
radio
emission from the Milky Way
radio
emission from the Sun
radio
(emission) intensity
peak
radio
emission intensity
radio
emission of the halo
radio
emissive components
radio
emissivity
radio
emitter
radio
emitting area
radio
emitting region
distribution of
radio
energy
radio
evidence
radio
fade-out
radio
features
radio
flare event
radio
flashes
radio
flux
astronomical
radio
frequencies
radio
frequency
radio-frequency
albedo
radio-frequency
amplifier
radio(-frequency)
band
radio-frequency
discharge tube
radio(-frequency)
disk
radio-frequency
emission
radio(-frequency)
energy
radio(-frequency)
flux density
radio(-frequency)
isophotes
radio-frequency
line
galactic
radio-frequency
noise
radio-frequency
power
radio-frequency
radiation
radio-frequency
range
radio-frequency
rays
tuned
radio-frequency
receiver
radio-frequency
region
radio-frequency
spectrum
radio
galaxy
radio
heliograph
radioheliograph
radio
image
radio
impulse
radio
interference
radio
interferometer
radio
interferometer observations
radio
interferometer record
radio
interferometer recording
radio
investigations
radio
link
radio
link system
radio
longitudes of Jupiter
radio
luminosity
radio
luminosity function
radio
magnitude
radio
map
radio
map of the Galaxy
radio
means
radio
measurements
21-cm
radiometer
radiometer
calibration
radiometer
excess noise temperature
radiometer
output
radiometer
receiver
radiometer
sensitivity
radiometer
stability
radiometer
system
radiometer
(system) noise
overall
radiometer
system noise
radio
method
radiometric
radiometric
magnitude
radiometric
map
radiometric
measurements
radio
nebula
solar
(radio)
noise
radio
noise
cosmic
radio
noise absorption
radio
(noise) outburst
radio
nonthermal brightness temperature
radio
object
solar
radio
observations
Nancay
radio
observatory
radio
occupation
Jovian
radio
outburst
radio
performances
radio
phenomenon
radio
picture
radio
picture of the Sun
radio
plage
radio
plage component
radio
polarimeter
radio
polarization
radio
position
radio
position measurement
radio
power
radio
pulse
radio
radiation
radio
range
radio
range of frequencies
radio
range of wavelengths
radio
receiver
radio
receiving apparatus
radio
red shift
radio
redshift
radio
reflection
radio
reflection method
radio
reflector
radio
region
radio
results
radio
scintillation
radio
signal
radio
size
radio
sky
radio
sky temperature
spectrum of
radio
source
radio
source count
radio
source density
radio
source distribution
radio
source galaxy
radio
source observations
decameter
(radio)
sources
survey of
radio
sources
radio-source
spectrum
radio
source structure
radio
spectral index
21-cm
radio
spectral line
radio
spectrograph
radio-spectrograph
radio
spectrometer
radio
spectroscopy
solar
radio
spectrum
radio
spot
weak
radio
star
radio
star diameter
radio
star distribution
radio-star
interferometer
radio
star interferometry
radio
star investigations
radio-star
luminosity
radio
star position
radio
star record
scintillation of
radio
stars
radio
star statistics
radio
star studies
radio
star survey
radio
star trace
radio
star twinkling
radio
star work
radio
storm
radio
Sun
radio
techniques
steerable
(radio)
telescope
Parkes
radio
telescope
radio
telescope antenna
radio
telescope beam
radio
telescope of great sensitivity
radio
telescope receiver
radio
temperature
ratio of
radio
to light emission
ratio of
radio
to optical power emitted
radio
tracking
radio
transmitter
radio
universe
radio-wave
emission
radio
wave generation
solar
radio
wave intensity
cosmic
radio(wave)
intensity
radio
wavelength band
radio
wavelengths
radio-wave
propagation
radio
wave region
thermal
radio
waves
radio
(wave) scattering
radio
waves from space
radio
waves from the Galaxy
radio
wave spectrum
radio
window
radio
Zeeman effect
radium
terrestrial
radius
radius
vector
radome
variable-speed
R.
A. drive
raies
ultimes
coronal
rain
rainbow
raise
rate
Raman
active vibration
Raman
bands
Raman
effect
Raman
inactive vibration
Raman
line
Raman
scattering
Raman
spectrum
R.A.
micrometer
Ramsauer
effect
Ramsden
disk
Ramsden
eyepiece
Ramsden
ocular
Ramsden's
eyepiece
random
distribution
randomly
polarized
random
motions
random
noise
random
polarization
random
process
random
sample
random
velocities
free spectral
range
range
dispersion of signals
range
measurement
range
of brightness response
radio
range
of frequencies
range
of luminosity
range
of phase angles
range
of sensitivity
range
of variation
radio
range
of wavelengths
long
range
studies
rapid-acting
developer
rapid
development
rapid
drying
rapid
fixing bath
rare
earth elements
raster
scan
RAS
thread
RATAN-600
zenithal hourly
rate
rate
of drive
rate
of emission
rate
of expansion
rate
of fading
rate
of flow of radiation
rate
of frequency drift
rate
of ionization
rate
of occurrence
rate
of recession
angular
rate
of rotation
cone-and-disk
rater
Strehl
ratio
intensity
ratio
in multiplets
intensity
ratio
in Zeeman components
ratio
of minimum to maximum in record
ratio
of minimum to maximum of interference fringes
ratio
of optical to radio emission
ratio
of radio to light emission
ratio
of radio to optical power emitted
raw
data
raw
image
secondary cosmic
ray
cosmic
ray
burst
cosmic
ray
counter
ray-crater
cosmic
ray
decrease
gamma
ray
detector
cosmic
ray
electrons
cosmic
ray
energy
cosmic
ray
event
total cosmic
ray
experiment
cosmic
ray
flare
cosmic
ray
flux
sudden cosmic
ray
increase
cosmic
ray
intensity
rayleigh
Rayleigh
criterion
Rayleigh
distribution
Rayleigh
fading
Rayleigh-Jeans
approximation
Rayleigh-Jeans
formula
Rayleigh-Jeans
law
Rayleigh
numbers
Rayleigh-resolution
Rayleigh
scattering
Rayleigh's
phase function
ray
of minimum deviation
cathode
ray
oscilloscope
cosmic
ray
particles
cosmic
ray
production
cosmic
ray
protons
hard X
ray
region
paraxial
rays
infrared
ray
sensitive emulsion
cosmic
ray
spectrum
cosmic
ray
spike
cosmic
ray
storm
ray
structure
ray
system
gamma
ray
telescope
ray
tracing
Ockham's
razor
R-branch
R
center
R
Coronae Borealis star
R
Coronae (Borealis) variables
,
Re
reactance
amplifier
thermonuclear
reaction
machine
readable
form
zero
reading
reading
device
reading
micrometer
reading
of circle
meridian mark
readings
real
real
brightness
real
color
real
focus
real
image
real
position
real
size
real
Sun
receding
galaxies
nebula
receding
nebulae
receding
star
received
echo
received
power
received
radiation
received
reflection
super heterodyne
receiver
receiver
band
receiver
band pass
receiver
bandwidth
receiver
fluctuations
receiver
gain
receiver
gain fluctuations
receiver-gain
variations
receiver
input
spaced
receiver
method
receiver
noise
receiver
noise factor
receiver
noise figure
receiver
noise power
receiver
noise (power) level
receiver
(noise) temperature
excess
receiver
noise temperature
receiver
output
receiver
output fluctuations
receiver
output meter
receiver
sensitivity
receiver
system
receiver
tuning
receiver
using Dicke switch
receiving
antenna
receiving
apparatus
receiving
area
receiving
beam
receiving
equipment
receiving
system
reception
(sensitivity) pattern
speed of
recession
recession
of galaxies
recession
velocity
reciprocal
linear dispersion
principle of
reciprocity
reciprocity
curve
reciprocity
failure
reciprocity
law
photographic
reciprocity
law failure
dead
reckoning
position
recognizable
recognizable
diffuse levels
recoil
electron
radiative
recombination
recombination
coefficient
recombination
continuum
recombination
line
recombination
spectrum
two-aerial interferometer
record
tape
recorder
recorder
sensitivity
solar
recording
recording
camera
recording
device
recording
element
recording
instrument
recording
meter
recording
microphotometer
recording
paper
recording
system
method of
recording
transits
record
of radio waves
record
of the Sun
recover
recovery
rectangular
axes
rectangular
components
rectangular
coordinates
rectangular
source
rectangular
velocity components
phase-sensitive
rectifier
rectifier
photocell
twenty-seven-day
recurrence
twenty-seven-day
recurrence
tendency
recurrent
recurrent
disturbance
recurrent
group
recurrent
nova
recurrent
outburst
recurring
comet
towards the
red
reddened
star
interstellar
reddening
reddening
curve
reddening
ratio
red-dot
finder
red
dwarf
red
dwarf star
red
end
red
giant
red
giant star
redistribution
redistribution
in frequencies
red
line
relativity
red
shift
radio
redshift
red-shift
effect
red-shift
phenomenon
red
star
red
supergiant
reduce
reduced
elongation
reduced
mass
reduced
radiation
reduced
spot number
reduced
term
focal
reducer
noise
reduction
image
reduction
and analysis facility
reduction
from apparent place to mean place
reduction
of observations
reduction
of plates
reduction
process
reduction
screen
reduction
to the Sun
reemission
reemit
reexposure
system of
reference
reference
circle
reference
color
reference
mark
reference
position
reference
star
southern
reference
star program(me)
southern
reference
stars
reference
system
reference
to...
refer
to...
refigure
refiguring
reflect
reflectance
reflected
echo
reflected
image
reflected
light
reflected
pulse
reflected
ray
reflected
signal
reflected
sunlight
reflected
wave
effective
reflecting
area
reflecting
membrane
reflecting
mercury basin
reflecting
nebula
reflecting
power
reflecting
prism
reflecting
screen
reflecting
sheet
reflecting
slit jaw
diffusely
reflecting
sphere
reflecting
surface
reflecting
telescope
reflecting
wire mesh
total
reflection
reflection
coefficient
reflection
echelon
reflection
factor
reflection
grating
reflection
index
reflection
loss
radio
reflection
method
reflection
nebula
total
reflection
prism
reflective
coating
reflective
power
silver
reflectivity
tillable
reflector
paraboloid
(reflector)
antenna
reflector
concrete reflector
Baker
reflector-corrector
reflector-corrector
telescope
reflector
framework
parabolic
(reflector)
radio telescope
arm of
reflectors
reflector
telescope
reflector(-type)
antenna
single lens
reflex
camera
reflexion
reflex
zenith tube
refocus
reform
of calendar
refracting
angle
refracting
edge
refracting
telescope
refraction
refraction
anomalies
refraction
correction
correction for average
refraction
effect
refraction
effects
refraction
in irregularities
apparent rotation by
refraction
of field
refraction
of radio waves
refraction
oscillations
refractive
refractive
effects
refractive
index
refractive
power
refractivity
Yerkes
refractor
refrigerated
soft X-ray
region
region
around the pole
region
of correct exposure
region
of origin
region
of over-exposure
central
region
of the Galaxy
region
of under-exposure
21-cm line emitting
regions
registering
apparatus
registering
micrometer
photographic
registration
photoelectric
registration
of star transit
linear
regression
regression
of nodes
regrind
regular
doublet
regular
doublet law
regular
galaxy
regular
multiplet
regular
reflection
regular
term
regular
variables
temperature
regulating
system
regulator
light pollution
rejection
filter
spectrum-luminosity
relation
solar-terrestrial
relations
harmonic
relationship
small angle
relationships
field
relations
of gravitation
relative
absorption
relative
aperture
relative
brightness
relative
declination
relative
exposure
relative
intensity
relative
line strength
relative
luminance curve
relative
luminosity factor of radiation
Wolf
(relative)
number
relative
parallax
relative
position
relative
proper motions
relative
right ascensions
relative
scale of distances
relative
sensitivity
radial velocity
relative
to the Sun
relative
visibility
relativistic
relativistic
astrophysics
relativistic
correction
relativistic
cosmology
relativistic
degenerate gas
relativistic
effects
relativistic
electrons
relativistic
particles
relativistic
perturbing force
relativistic
protons
relativistic
theory
relativistic
wave equation
special theory of
relativity
relativity
correction
relativity
doublet
relativity
mechanics
relativity
red shift
relativity
shift
relativity
theory
relaxation
relaxation
time
relay
lens
relay
station
release
to
release
the shutter
reliable
eye
relief
gelatine
relief
formation
remaining
error
remaining
star
remains
supernova
remnant
stellar
remnant
of a supernova
remnants
of the supernova of A. D.
remote
antenna
remote
control
remotely
controled telescope
remote
motorized control
remote
observing
remote
sensing
remote
stars
dew
remover
reobservation
repetitive
arrangement
replica
grating
repolish
irreducible
representation
gravitational
repulsion
repulsive
energy
solar
repulsive
force
repulsive
interaction
repulsive
potential curve
repulsive
state
reradiation
rereduce
rereduction
spectroscopic
research
Particle Physics and Astronomy
Research
Council
Association of Universities for
Research
in Astronomy
astronomical
research
project
research
rocket
Southern astrophysical
research
telescope
reseau
residual
residual
aberration
residual
error
residual
image
residual
intensity
residual
velocity
resilver
wave
resistance
equivalent
resistor
spectral
resolution
Center for High Angular
Resolution
Astronomy
resolution
in direction
resolution
in frequency
high
resolution
interferometer
high
resolution.
investigations
resolution
of a nebula
resolvable
sources
resolve
resolve
into individual stars
time
resolving
resolving
power
proton magnetic
resonance
resonance
absorption
resonance
band
resonance
degeneracy
resonance
effect
resonance
fluorescence
resonance
line
optical-double
resonance
method
resonance
photon
resonance
scattering
Wood's
resonance
series
atomic beam
resonance
spectroscopy
resonance
spectrum
non-linear
response
sidelobe
(response)
level
responsive
quantum efficiency
local standard of
rest
rest
mass
restricted
three-body n
result
resultant
angular momentum
resultant
impulse
resultant
orbit
resultant
power
resultant
spin
resulting
diagram
radio
results
retardation
retardation
of expansion
retardation
of transit
retarder
reticle
reticle
assembly
reticule
retina
retinal
image
retrograde
retrograde
direction
retrograde
motion
retrograde
rotation
retrorocket
return
returned
echo
returned
power
returned
signal
returned
spectrum
central
reversal
reversal
mechanism
reversal
motor
reversal
of image
reversal
of magnetic polarity
reversal
of polarization
reversal
system
reverse
reversed
measures
reverse
n
reversible
reversible
film
reversible
mounting
reversible
transit
reversible
transit circle
reversing
F
reversing
prism
phase
reversing
switch
revised
Baumbach-formula
Harvard
revised
catalog
nodical
revolution
revolution
period
revolve
revolving
sector
rewind
Reynolds
number
rf-discharge
tube
rheostat
rhodopsin
rhombic
antenna
rhythmic
signals
()
R,
I
,
Ri
ribbed
mirror
rib(bed)
structure
Ricci
tensor
Richardson
number
Riemann-Christoffel
tensor
Riemannian
space
declination and
right
ascension
true
right
ascension at date
right
ascension circle
right-ascension
circle
right-ascension
determinations
right-ascension
drive
right-ascension
drive motor
right-ascension
gear
right-ascension
line
relative
right
ascensions
right-ascension
screw
right-ascension
worm wheel
rigidity
rigid
linear rotator
rigid
symmetric top
crater
rim
diamond
ring
ring
antenna
ring
aperture
ring
current
ring
girder
ring
micrometer
ring
mountains
ring
nebula
Newton's
rings
ring
system
ring
truss
riometer
light
ripples
rise
heliacal
rising
rising
prominence
Ritchey-Chretien
telescope
Ritz
series formula
RK
RKE
RKE
eyepiece
RK
eyepiece
R-magnitude
r.m.s.
noise
robotic
telescope
robot
observing station
Roche
limit
Rochon
prism
pulverized
rock
two-step
rocket
rocket
astronomy
rocket-borne
rocket-borne
instruments
rocket-borne
photograph
rocket-borne
receiver
rocket
data
rocket
motor
rocket
observations
rocket
photography
rocketry
rocket
spectroscopy
rocket
technology
optical
rocket-tracking
telescope
rock
fault
rocking
mirror
rocking
vibration
rocky
core
focusing
rod
rod
cell
rodopsin
Roentgen
spectrometry
Observatorio del
Rogue
de los Muchachos
Ronchi
grating
Ronchi
test
run-off
roof
thermostatically controlled
room
root-mean-square
root-mean-square
velocity
Roque
de los Muchachos observatory
law of Bunsen and
Roscoe
rosette
motion
Ross
correcting lens
Ross
corrector
Rosseland
mean
Rosseland
mean absorption coefficient
rotary
rotate
rotating
mirror
rotating
polarizer
rotating
sector
rotating
shutter
rotating
star
image
rotation
rotational
axis
rotational
broadening
rotational
constant
rotational
distortion
rotational
energy
rotational
entropy
rotational
level
rotational
oscillation
rotation(al)
period
rotational
perturbation
rotational
quantum
rotational
state
rotational
structure
rotational
sum rule
rotational
temperature
rotational
term
rotational
transition
rotational
velocity
synodic period of
rotation
at the equator
rotation
band
apparent
rotation
by refraction of field
galactic
rotation
curve
rotation
of the field of view
rotation
partition function
synodic
rotation
period
rotation
rate
rotation
spectrum
rotation-vibration
band
rotation-vibration
energy
rotation-vibration
spectrum
rotation-vibration
state
phase
rotator
rough
agreement
rough
grinding
Rowland
circle
Rowland
ghost
Rowland
mounting
Rowland
scale
Astronomer
Royal
Royal
Astronomical Society
Royal
Greenwich observatory
Royal
observatory, Edinburgh
Royal
observatory, Greenwich
Rozhen
observatory
R
region
RR
Lyrae stars
RR
Lyrae variables
()
RR
R
star
R-type
star
ruby
laser
ruby
maser
ruby
maser radiometer
rugged
features
rule
sum
rule
intensity
selection
rules
grating
ruling
run
Runge
law
running
number
running
term
run-off
roof
Russell
diagram
Russell-Hertzsprung
diagram
Russel-Sounders
coupling
Rydberg
constant
Rydberg-Ritz
formula
Rydberg-Schuster
law
R-
R-
R-
()
R
R-
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