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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
semiregular variables
optical semithickness
sensibility
sensibilization
remote sensing
temperature sensitive
sensitive amplifier
sensitive bolometer
phase sensitive detector
sensitive emulsion
sensitive film
light sensitiveness
position sensitive proportional counter
sensitive receiver
sensitive region
sensitive to light
threshold of sensitivity
equal sensitivity contours
visual sensitivity curve
sensitivity distribution
threshold gradient sensitivity function of eye for grains
sensitivity of system
reception (sensitivity) pattern
sensitivity pattern
optical sensitization
sensitize
noncolor sensitized
sensitizer
spectral sensitizing
sensitometric processing
Hartmann sensor
sensory system
separably degenerated
Hartley's law of doublet separating
opposite polarities separating line
nuclear separation
separation angle
separation image
angular separation of fringes
septet multiplet
spectral sequence
sequence of galactic types
main sequenceof star types
sequence of structural forms
term sequences
sequence star
Wood's resonance series
series discontinuity
series disintegration
Ritz series formula
series limit
L long series of observations
trigonometric series of parallaxes
Serrurier truss
time service
time service clock
time service instrument
time service station
servo
servomechanism
servomotor
servo system
servosystem
NASA extragalactic data set
set of comparison stars
set of observations
set rate
setting
setting circle
setting error
setting motion
setting on star
to set up
seven-inch transit circle
sextant
sextet multiplet
sextet state
Sc Seyfert galaxy
shade number
shade tube
optical shadow
shadow-band pattern
shadow bands
shadow-band structure
shadow method
shadow pattern
shadow photometer
shadow transit
polar-axis shaft
() "shallowing"
Shanghai observatory
galactic shape
investigation of shape of pivots
shape of pulse
sharp edge
sharpening
sharp image
sharp series
sharp solar limb
shearing interferometer
reflecting sheet
sheet reflector
gaseous shell
clam shell dome
shell of gas
shell spectrum
shell star
shell structure
light shield
shielding
blue shift
phase shifter
zero image shift focuser
seeing shifts
shininess of the Moon's surface
space ship
shock front
shock tube
shock wave
shooting star
short dipole
short (duration) burst
telescope of short focal length
short-focus objective
short-lived burst
short-period
short-period comet
short-period erratic motions
short-period perturbation
short scan
shortward
short-wave end
short-wave fade-out
short-wave radiation
shot effect
shot noise
shoulder
nighttime shower
shower meteor
air showers
Lanphier shutter
shutter aperture
shutter arches
shutter exposure
shutter mechanism
shutter opening
dome shutters
radiation sickness
visible side
broad side array
side effect
side lobe
sidelobe
sidelobe (response) level
the galaxy seen side-on
sidereal
sidereal clock
sidereal day
sidereal drive
sidereal mean daily motion
sidereal month
sidereal period
sidereal period of rotation at the equator
tracking at sidereal rate
sidereal-rate tracking mechanism
sidereal rotation
sidereal rotation period
sidereal second
local sidereal time
sidereal time at mean midnight
sidereal year
sideriostat
siderite
siderolite
siderostat
Siding Springs observatory
Siegbahn unit
line of sight
sighting telescope
sight line
sight-line velocity
line of sight velocity
-, σ
σ-bond
sigma orbital
σ-polarization
σ-
σ-
astronomical sign
wanted signal
standard signal generator
picture signal monitor
signal/noise
signal/noise performance
signal-noise ratio
signal/noise ratio
signal power
timing signals
signal-to-noise
signal-to-noise level
signal-to-noise ratio
signature of metric
sign convention
significance level
significant figures
sign of the zodiac
optical silica
fused silica mirror
silicon
silicon photocell
La Silla observatory
silver bromide emulsion
silver bromide grain
silver chloride emulsion
silver-disk pyrheliometer
silver film
exposed silver grains
silver image
silvering
silver iodide emulsion
silverless image
silver reflectivity
principle of similarity
antenna simple antenna
simple burst
simple eyepiece
simple harmonic oscillator
simple interferometer
simple lens
simplified model
target simulator
single antenna
single aperture
single-beam spectrometer
single-emulsion film
single exposure
single flat arrangement
single frequency observation
single frequency radiometer
single-frequency record
single lens reflex camera
single-level absorption
single-picture taking
single spot
single star
singlet
singlet line
singlet multiplet
singlet state
singlet term
singularity
singular state
S-interaction
observing site
site group
observatory site selection
observatory site survey
site surveys
site telescope
site testing
site tests
Einstein-de Sitter cosmology
Einstein-de Sitter model
de Sitter's model
de Sitter's universe
Einstein-de Sitter universe
six-color photometry
six-color system
six-constant method
sizable telescope
telescope size
size measurement
effective size of the Sun
size orbit size
angular size work
skeletal vibration
sweeps of sky
International Dark Sky association
sky atlas
sky background
total sky brightness
sky brightness temperature
sky darkness
deep sky filter
sky glow
photometric skyies
sky light
night sky luminance
sky monitor
total sky noise
deep sky object
sky of stars
sky patrol
sky-patrol
sky radiation
sky spectrum
STScI digital sky survey
radio sky temperature
turbulent slab
plane-parallel slabs
S, Λ-
slap
tilting screen made of slats
slewing
slewing drive
slewing-drive assembly
slewing motion
slewing motor
slew(ing) rate
sliced paraboloid
image slicer
vertical slide
slide carrier
spectroscope slit
slit assembly
slit image
slit jaw
slitless spectrograph
slit-less spectroscope
slitless spectrum
slit mechanism
wide slit spectrograph
slit spectrum
slit width
slit-width adjusting screw
Sloan digital sky survey
talus slope
slope of ray
slot
slow-acting developer
slow development
slow-drift burst
slowing-down radiation
slowly varying component
slow motion
slow-motion drive
slow motion drive assembly
slow plate
slow scan
SLR camera
small angle relationships
small-angle scattering
small-aperture telescope
small circle
small (diameter) source
smallest detectable signal
small flare
small flare event
small meteor
small planet
small-scale motions
small telescope
smart drive
smeared band
to smear out
Smithsonian astrophysical observatory
smoked glass
smoothed curve
homogeneous smoothed-out model
antenna smoothing
smoothing process
S/N
Snell's law
SNO
SNO neutrino detector
SO
SOAR
SOAR telescope
astronomical societies
Royal Astronomical Society
Astronomical Society of Pacific
Publication of the Astronomical Society of the Pacific
support socket
sodium iodide detector
soft component
soft developer
softening of radiation
soft landing
very soft radiation
orrery software
soft X-ray region
soft X-rays
SO galaxy
(solar)
solar
solar active region
forecast of solar activity