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M
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P
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Q
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R
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W
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1956 "D"
D
remnants of the supernova of A.
D.
daily
daily
error
daily
map
sidereal mean
daily
motion
daily
revolution
daily
rotation
daily
variation
Dall-Kirkham
telescope
Dalton
law
damp
air
damped
oscillation
damping
damping
broadening
damping
constant
damping
factor
damping
wing
Danjon
astrolabe
Danjon
scale
dark
(absorption) nebula
dark
adaptation
dark
area
dark
band
dark
cloud
dark
companion
dark
current
dark
dome
law of
darkening
darkening
coefficient
darkening
to limb
dark
exposure
dark
flocculus
dark
Fraunhofer lines
dark
hemisphere
dark
line
dark
material
sky
darkness
dark
noise
dark
obscuring lane
dark
obscuring matter
dark
room
dark-room
illumination
dark
side
International
Dark
Sky association
dark
sky background
dark
slide
dark
star
dark
subtraction
dashed
term
raw
data
data
analysis
Hubble
data
archive
Lyon-Meudon extragalactic
database
National Space Science
Data
Center
digital
data
presentation
techniques of
data
processing
data
reduction
NASA extragalactic
data
set
modified Julian
date
international
date
line
date
of supernova
D
atom
David
Dunlap observatory
Dawes
limit
false
dawn
lengthening of the
day
day
airglow
day
glow
daylight
daylight
exposure
daylight
hemisphere
daylight
saving time
day(light)
side
daylit
hemisphere
independent
day
numbers
magnetically quiet
days
day
sky
day-time
meteor
day-time
meteor activity
daytime
radiant
daytime
shower
daytime
stream
dazzlernent
free-burning
dc
arc in air
free-burning
dc
arc in vacuum
DC
comparison radiometer
H and
D
curve
deactivating
collision
dead
air
dead
reckoning position
dead
time
Instituto
de
Astrofisica de Canarias
heat
death
volcanic
debris
debris
of supernova
de
Broglie wavelength
principal source of
decameter
activity
decameter
burst
decameter
observations
decameter
(radio) sources
decameter
radio storm
decameter
radio waves
decameter
source regions
decameter(-wave)
emission
decameter
(wavelength) band
decameter
(wavelength) radiation
decameter
(wavelength) range
decameter
wavelength region
decameter
wavelengths
decameter
waves
decameter(-wave)
spectrum
decametric
decametric
emission
Instituto de Astrofisica
de
Canarias
radioactive
decay
decayed
atom
decay
law
decay
photon
deceleration
decibel
decimeter
burst
decimeter
component
decimeter
continuum
decimeter
observations
decimeter
radio waves
decimeter(-wave)
emission
decimeter
(wavelength) band
decimeter
(wavelength) radiation
decimeter
(wavelength) range
decimeter
wavelength region
decimeter
waves
decimeter(-wave)
spectrum
decimetric
emission
decimillistilb
secular secular in
declination
declination
and right ascension
declination
angle
true
declination
at date
declination
axis
declination(-axis)
bearings
declination
box
declination-box
frame
declination
circle
declination
determinations
declination
drive
declination-drive
system
declination
gear
declination
gear device
declination
micrometer
declination
motion
declination
observations
errors in
declinations
declination
trunnion
declination
worm
decline
rate
decollimation
decomposition
probability
Fourier
deconvolution
Forbush
decrease
Balmer
decrement
decrement
of visual threshold
Centre
de
Donnees astronomiques de Strasbourg
deep-dust
model
solar model in
deeper
layers
deep
sky filter
deep
sky object
deep
space network
deexcitation
term
defect
defective
illumination
deferent
define
defining
defining
pad
defining
support
definition
deflection
deflection
angle
deflection
drift
defocus
defocusing
nuclear
deformation
deformation
vibration
resonance
degeneracy
degenerate
separably
degenerated
triple
degenerated
species
degenerate
electron
relativistic
degenerate
gas
degenerate
gas law
degenerate
matter
degenerate
star
degenerate
state
degrading
of bands
square
degree
degree
of arc
degree
of dissociation
degree
of ellipticity
degree
of freedom
degree
of ionicity
degree
of ionization
degree
of openness of spiral
Observatoire
de
Haute Provence
time
delay
delayed
pulse
time
delay
integration
delay
line
delineation
of meteor radiants
Dellinger
effect
Observatorio del Rogue
de
los Muchachos
Roque
de
los Muchachos observatory
Observatorio
del
Rogue de los Muchachos
,
δ
Delta
Cephei stars
δ
Observatorio
del
Teide
demount
dense
cluster
varying
density
number/flux
density
count
density
difference
probability
density
distribution
density
distribution of hydrogen
variable
density
filter
density
gradient
density
in space
density
ionization
density
law
density
of galaxies
mean
density
of matter
density
of plate
electron
density
per unit length
number/flux
density
relation
number/flux
density
statistics
method of
dependences
depolarization
depolarization
factor
depolarizer
depression
depression
of continuum
radar
depth
depth
of asphericity
depth
of focus
Instituto Argentino
de
Radioastronomia
Institut
de
radio astronomie millimetrique
image
de-rotator
Van
der
Waals forces
van
der
Waals interaction
descending
node
descriptive
astronomy
deserts
homological transform
design
de
Sitter's model
de
Sitter's universe
main control
desk
Deslandres-d'Azambuja
bands
Deslandres
table
Centre de Donnees astronomiques
de
Strasbourg
destructive
interference
electron
detachment
detail
detailed
balancing
detailed
exposure
detailed
structure
surface
details
limit of
detectability
smallest
detectable
signal
number of
detectable
sources
correlation
detection
overall
detection
efficiency
coherent
detection
spectroscopy
detective
quantum efficiency
normalized
detectivity
X-ray
detector
detector
image detector
deterioration
of image
secular
determinant
distance
determination
right-ascension
determinations
detonating
bolide
Centre National
d'Etudes
Spatiales
stellar
deuterium
deuterium
line
deuterium
line radiation
develop
developability
developed
image
developed
plate
life of
developer
developing
developing
bath
developing
room
uniform
development
sunspot
development
chart
development
curve
development
fog
development
time
standard
deviation
deviation
angle
deviative
prism
charge coupled
device
position-measuring
devices
dewar
dew
cap
dewcap
dew
remover
D
F
star
diagonal
diagonal
group
diagonal
line of multiplet
diagonal
mirror
diagonal
sum rule
two color
diagram
sun
dial
induced
diamagnetism
diameter visual
diameter
diameter
data
diameter
measurement
small
(diameter)
source
large
diameter
source
diameter
visual diameter
diamond
milling
diamond
ring
iris
diaphragm
diaphragm
aperture
diapositive
diatomic
molecule
Osservatorio
di
Bologna
Osservatorio
di
Brera
dichotomize
dichotomy
dichroic
crystal
dichroic
mirror
Dicke
method
Dicke
radiometer
Dicke's
arrangement
Dicke's
technique
receiver using
Dicke
switch
Dicke
system
Dicke
system receiver
astronomical
dictionary
dielectric
constant
dielectronic
recombination
tone
difference
difference
band
chromatic
difference
of magnification
difference
of path
differential
aberration
differential
colorimeter
differential
coordinates
differential
determinations
differentially
differential
method
differential
motion
differential
observations
differential
observing
differential
refraction
differential
refraction effects
differential
rotation
differential
solar rotation
differential
work
differentiation
diffract
diffracting
screen
X-ray
diffraction
diffraction
fringe
diffraction
grating
diffraction
image
diffraction
limited optics
diffraction
limited resolution
diffraction
maxima
diffraction
of radio waves
Fresnel
diffraction
pattern
diffraction
rings
diffraction
spectrograph
diffraction
spectroscope
diffraction
spectrum
diffuse
diffuse
band
diffuse
galactic light
diffuse
interstellar bands
recognizable
diffuse
levels
diffusely
reflecting sphere
diffuse
matter
diffuse
nebula
to
diffuse
out
uniform
diffuser
diffuse
radiation
diffuse
radiation field
diffuse
reflection
diffuse
series
diffuse
sunlight
diffuse
transmission
diffusing
effect
diffusing
screen
diffusing
surface
neutron
diffusion
atmospheric
diffusion
coefficient
diffusion
function
diffusion
rate
diffusion
velocity
thermal
diffusivity
Digges'
telescope
binary
digit
digital
camera
electronic
digital
computer
digital
data presentation
digital
method
digital
recording system
STScI
digital
sky survey
digitized
sky survey
digitizer
digit
printer
potassium
dihydrogen
phosphat
time
dilatation
galactic
dilation
dilute
aperture
diluted
radiation
stellar
dilution
factor
physical
dimension
galactic
dimensions
dim
vision
tunnel
diode
diode
noise generator
diode
noise source
varactor
(diode)
parametric amplifier
tunnel
diode
parametric amplifier
diopter
dioptric
dioptrical
dioptrics
dioptric
system
dioptric
telescope
dioptrique
carbon
dioptry
magnetic
dip
dip
of horizon
dip
of the horizon
half-wave
dipole
half-wave
(dipole)
antenna
dipole
antenna
dipole-dipole
interaction
dipole
feed
dipole
moment
dipole-quadruple
interaction
magnetic
dipole
radiation
broadside array of half-wave
dipoles
Dirac
matrixes
Dirac's
equation
Instituto
di
Radioastronomia
direct
colorimetry
direct-current
comparison radiometer
direct
exposure
scintillation in
direction
directional
directional
antenna
overall
directional
diagram
directional
discrimination
directional
distribution
directional
flux
directional
information
direction
cosines
direction
of baseline
direction
of galactic center
poorly
directive
antenna
directive
coefficient
source
directivity
directivity
of radiation
directivity
pattern
direct
measurement
direct
measures
direct
motion
direct
observations
direct
photograph
direct
photography
direct
plate
direct
radiation
direct
radiometer
direct
ray
direct-reading
scale
direct
receiver
direct
reflection
direct
sunlight
direct
technique
direct-vision
prism
direct
vision spectroscope
direct-vision
spectroscope
direct
wave
direct-writing
recorder
dirty
image
sudden
disappearance
disc
barely
discernible
hollow cathode
discharge
discharge
in vacuum
gas
discharge
noise generator
radio-frequency
discharge
tube
discontinuities
in flexure
discontinuities
in instrumental system
Balmer
discontinuity
discover
discoverer
discovery
discrepancies
in motion
discrepancy
discrete
discrete
band
discrete
energy levels
discrete
energy state
discrete
radio star
discrete
source
directional
discrimination
discrimination
in range
discriminator
spherical
dish
twin
dish
interferometer
dish
type radio telescope
spontaneous
disintegration
Ramsden
disk
disk
dial
disk
flare
emission from
disk
of the Galaxy
transit across the
disk
of the Sun
Stoneyhurst solar
disks
radio
disk
temperature
disk
temperature of planet
dismount
cross
disperser
dispersing
unit
velocity
dispersion
dispersion
coefficient
Hartmann
dispersion
formula
dispersion
in luminosity of sources
dispersion
in velocity
range
dispersion
of signals
dispersion
prism
dispersive
power
displaced
atom
displaced
doublet
displaced
term
total
displacement
displacement
coordinates
Wiens's
displacement
law
displacements
in photographic film
cathode-ray oscillograph
display
tidal
disruption
disruption
theory
image
dissector
dissociate
heat of
dissociation
dissociation
constant
dissociation
continuum
dissociation
energy
dissociation
equation
dissociation
equilibrium
dissociation
limit
dissociation
of galactic cluster
dissociation
potential
dissolution
of group
north polar
distance
distance
determination
distance
from Earth
distance
measurement
distance
modulus
relative scale of
distances
distance
scale
distant
antenna
distant
galaxy
distant
nebula
distant
object
distant
radio star
distant
regions
distant
source
distant
stars
distorted
image
distorted
wave front
distorting
lens
pin cushion
distortion
lens
distortion
correction
distortion
in emulsion
seeing
distortions
distributed
source
normal
distribution
brightness
distribution
across the source
brightness
distribution
across the Sun
velocity
distribution
diagram
distribution
in latitude
distribution
in longitude
light
distribution
in seeing image
distribution
in space
Maxwellian
distribution
law
distribution
of emission
distribution
of galaxies
density
distribution
of hydrogen
distribution
of matter
distribution
of radiation
brightness
distribution
of radio disk
distribution
of radio energy
angular
distribution
of sources
world-wide
disturbance
disturbance
diurnal
disturbance
energy
disturbance
to seeing
disturbed
disturbed
areas
disturbed
day
magnetically
disturbed
days
disturbed
magnetic variation
disturbed
region
disturbed
Sun
disturbed
Sun emission
disturbed
Sun radiation
disturbed
wave front
disturber
disturbing
agency
disturbing
effect
disturbing
F
disturbing
function
dithering
disturbance
diurnal
diurnal
aberration
diurnal
arc
diurnal
circle
diurnal
inequality
diurnal
libration
diurnal
method
diurnal
motion
diurnal
parallax
diurnal
rotation
diurnal
variation
luni-solar
diurnal
wave
divergence
divergence
angle
divergent
diverging
diverging
lens
diverging
motion in spot group
divided
circle
Gaussian
division
division
errors
division
line
D
lines
Dobsonian
mounting
dodging
sun
dog
Dollond
eyepiece
clam shell
dome
dome
balcony
dome
drive
dome
rotation
dome
seeing
dome
shutters
dome
slit
dome
trucks
dome
ventilation
Dominion
astrophysical observatory
Dominion
radio astrophysical observatory
Centre de
Donnees
astronomiques de Strasbourg
donor
barn
door
mounting
Doppler
broadening
Doppler
displacement
radio
Doppler
effect
Doppler
effect in photodissociation
Doppler
effect of thermal motion
Doppler
method
Doppler
shift
Doppler
spread
Dopplers'
principle
Doppler
velocities
Doppler
width
dot
image
wide
double
double
astrograph
double-beam
double-beam
photometer
double-beam
spectrometer
double-concave
lens
double-convex
lens
double
electron excitation
double
elliptical system
double
galaxy
double-image
micrometer
double-image
prism
double
interferometer
double
nebula
double
planet
double
refraction
double-slide
plate carriage
double
source
double
star
double
star astronomy
double
system
achromatic
doublet
regular
doublet
law
doublet
line
doublet
multiplet
doublet
objective
Hartley's law of
doublet
separating
doublet
splitting
doublet
state
doublet
structure
doublet
term
double-wire
Λ(-type)
doubling
doubly
degenerated species
doubly
ionized
stop
down
DQE
draconitic
month
satellite
drag
drain
Henry
Draper
catalog
Draper
classes
draperie
Henry
Draper
system
draw
tube
Dregion
rate of frequency
drift
drift
curve
drift-curve
drift
interferometer
drift
rate
drift
scan
smart
drive
drive
accuracy
plate
drive
arm
slow motion
drive
assembly
drive
gear
drive
mechanism
right-ascension
drive
motor
magnetically
driven
shock wave
motor
driven
thread
electrically
driven
tuning fork
main gear
drives
hour-angle
drive
system
variable-rate
driving
driving
apparatus
gravity-powered
driving
clock
driving
device
driving
gear
telescope
driving
mechanism
driving
motor
driving
rate
telescope
driving
system
driving
weight
black
drop
dry
dry
air
uneven
drying
dual-beam
dual
photometer
dual-rate
camera
dual-rate
moon(-position) camera
dual-rate
satellite camera
dual-rate
telescope
Carte
du
Ciel
acceleration
due
to gravity
DUMAND
DUMAND
neutrino detector
Pic
du
Midi observatory
dummy
antenna
dummy
dome
dummy
load
dumping
cone
David
Dunlap
observatory
duplicate
photographs
duplicity
radio echo
duration
short
(duration)
burst
duration
of exposure
duration
of one fringe
Cordoba
Durchmusterung
catalog
during
a lunation
dusk
zodiacal
dust
dust
absorption
dust
air
dust
cloud
dust
F
dust
grain
dust
lane
dust
nebula
dust
obscuration
dust
particles
dust
storm
dusty
matter
yellow
dwarf
dwarf
galaxy
dwarf
sequence
white
dwarf
star
dwarf-star
Dwingeloo
radio observatory
dynamical
astronomy
dynamical
equinox
dynamical
parallax
terrestrial
dynamical
time
dynamic
equilibrium
dynamic
range
stellar
dynamics
dynamics
of the Galaxy
dynamic
spectrograph
dynamic
spectrum
dynamic
spectrum observations
dynamic
spectrum record
atmospheric
dynamo
dynamo-currents
dynamo
theory
dynode
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