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4389 "S"
()
S
( )
S,
coal
sack
Sacramento
peak observatory
Sa
galaxy
sag
car
SAGE
SAGE
neutrino detector
sagitta
sagittal
sagittal
focus
Saha
equation
Saha's
equation
Saha's
ionization formula
random
sample
over
sampling
sampling
theorem
sandwich
construction
sandwich
mirror
SAO
SAO
star catalog
Saros
Sa
Sb galaxy
Sa
SB spiral
Sa
spiral
weather
satellite
satellite
astronomy
satellite-borne
satellite-borne
instruments
satellite
branches
satellite
camera
satellite
drag
satellite
in long-lived orbit
satellite
line
satellite
observations
satellite
observatory
Earth
satellite
orbit
artificial Earth
satellite
program(me)
satellite-range
measurement
satellite's
motion
satellite's
orbit
satellite
spectroscopy
satellite's
period
satellite's
spin
satellite
system
satellite
track
satellite
tracking
satellite
trail
satellite
vehicle
saturated
saturated
color
saturation
saturation
effect
saturation
function
daylight
saving
time
Sa
Sb
galaxy
S-branch
SB
Sb spiral
Sb
Sc galaxy
Sb
Sc spiral
SB
Sb
spiral
vernier
scale
scale
correction
scale
factor
relative
scale
of distances
scale
of micrometer
scale
of the Galaxy
scale
of the universe
gray
scale
resolution
true
scale
Value
scale
Value of telescope
grey
scaling
spiral
scan
scandium
scanner
two-dimensional
scanning
scanning
device
scanning
drive
scanning
element
frequency
scanning
method
scanning
motion
scanning
rate
scan
strip scan
scatter
scatter
diagram
scattered
beam
scattered
electrons
scattered
light
scattered
radiation
scattered
star light
scattered
starlight
scattered
sunlight
wide-angle
scattering
scattering
atmosphere
Thomson
scattering
coefficient
scattering
cross-section
scattering
effect
scattering
efficiency
scattering
electron
scattering
function
scattering
law
scattering
matrix
scattering
medium
scattering
power
scattering
theory
Sb
Sc
galaxy
term
scheme
scheme
of band heads
Schiefspiegler
telescope
solid-block
Schmidt
Schmidt
aplanatic sphere camera
super
Schmidt
camera
Schmidt
camera optics
Schmidt-Cassegrain
telescope
Schmidt
plate
Schmidt's
tube
Schmidt
system
UK
Schmidt
telescope
Schottky
effect
Schrodinger's
equation
Schuman-Runge
bands
Schuster-Schwarzschild
method
Schuster-Schwarzschild
model
Schuster's
n
Schwinger
radiation
space
science
National Space
Science
Data Center
Space Telescope
Science
Institute
scientific
probe
scintillate
scintillation
scintillation
counter
scintillation
detector
scintillation
effects
scintillation
fluctuations
scintillation
in direction
scintillation
in intensity
scintillation
measures
scintillation
noise
scintillation
of radio stars
scintillation
phenomenon
gas
scintillation
proportional counter
scintillation
spectrum
scissoring
vibration
sclera
sclerotic
SCNA
telluric absorption
S-component
scotch
mounting
scotopic
luminosity curve
scotopic
vision
S
s-coupling
image
scrambler
emulsion
scratch
wire
screen
screen
brightness
screen
brilliance
screen
efficiency
screen
illumination
screen
image
screening
screening
constant
screening
effect
screen
intensity
tilting
screen
made of slats
zenith-distance
screw
screw
micrometer
Sc
Seyfert galaxy
Sb
Sc
spiral
Sc
well-developed spiral
sea
interferometer
sea
interferometer
at
sea
level
sealing
wax
search
lunar
seas
season
seasonal
seasonal
anomaly
seasonal
changes
seasonal
variation
observing
seat
arc
second
second
art collision
second-art
transition
Cassegrain
secondary
secondary
color
secondary
cosmic radiation
secondary
cosmic ray
secondary
cosmic rays
secondary
eclipse
secondary
electron
secondary
emission
secondary
image
secondary
ionization
secondary
minimum
secondary
mirror
secondary
mirror cage
secondary
processes
secondary
prominence
secondary
ring
secondary
source
secondary
spectrum
secondary
star
second
contact
second
kind collision
Kepler's
second
law
second
of arc
second
of time
second
order Stark effect
second
subordinate series
second
subsidiary series
conic
section
column of unit cross
sectional
area
box
section
of tube
conic
sections
rotating
sector
sector
acceleration
sector
opening
yearly
secular
secular
aberration
secular
acceleration
secular
contraction
secular
determinant
secular
secular
in declination
secular
secular
in right ascension
secular
parallax
secular
perturbation
secular
precession
secular
secular in declination
secular
secular in right ascension
secular
term
seeing
seeing
bad
seeing
compensator
seeing
conditions
seeing
disk
seeing-disk
diameter
seeing(-disk)
profile
seeing
distortions
seeing
disturbance
seeing
effects
visual
seeing
estimate
seeing
fair
seeing
feature
seeing
good
seeing
image
seeing
measures
stellar
seeing
monitor
seeing
observations
seeing
phenomena
seeing
phenomenon
seeing
poor
visual
seeing
scale
seeing
shifts
seeing
study
seeing
test
seeing
very bad
comet
seeker
the galaxy
seen
edge-on
the galaxy
seen
side-on
integrated spectral
segment
segmented
mirror
Seidel
aberration
seismic
detector
selected
selected
area
selected
equinox
observatory site
selection
selection
effect
symmetry
selection
rule
selection
rules
selective
selective
absorber
selective
absorption
spectrograph interferometric with
selective
amplitude modulation
selective
diffuser
selective
effect
selective
radiator
selective
receiver
selective
sensitivity
selectivity
selenium
cell
selenocentric
selenocentric
orbit
selenodesy
selenographer
selenographic(al)
selenographic
coordinates
selenographist
selenography
selenological
selenology
self-absorption
self-adjusting
self-admittance
self-broadening
self-consistent
field
self-energy
self-excitation
self-feeding
self-gravitation
self-luminous
self-luminous
body
self-luminous
object
self-recording
self-recording
microphotometer
self-registering
self-reversal
self-winding
selsyn
Selvyn
granularity law
semiannual
term
semiconducting
bolometer
semiconductor
semidiameter
semidiurnal
secular
semi-indirect
illumination
semi-infinite
atmosphere
semi
major axis
semimajor
axis
semi
minor axis
semiminor
axis
semipermanent
Hα
semiregular
variables
optical
semithickness
sensibility
sensibilization
remote
sensing
temperature
sensitive
sensitive
amplifier
sensitive
bolometer
phase