• Sacramento peak observatory
• Sa galaxy
• sag car
• SAGE neutrino detector
• sagitta
• sagittal
• sagittal focus
• Saha equation
• Saha's equation
• Saha's ionization formula
• sampling theorem
• sandwich construction
• sandwich mirror
• SAO star catalog
• Saros
• Sa Sb galaxy
• Sa SB spiral
• Sa spiral
• 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
• 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
• S-branch
• SB Sb spiral
• Sb Sc galaxy
• Sb Sc spiral
• scale
• scale correction
• scale factor
• scale of micrometer
• scale of the Galaxy
• scale of the universe
• scale Value
• scale Value of telescope
• scan
• scandium
• scanner
• scanning
• scanning device
• scanning drive
• scanning element
• scanning motion
• scanning rate
• scan strip scan
• scatter
• scatter diagram
• scattered beam
• scattered electrons
• scattered light
• scattered radiation
• scattered starlight
• scattered star light
• scattered sunlight
• scattering
• scattering atmosphere
• scattering coefficient
• scattering cross-section
• scattering effect
• scattering efficiency
• scattering electron
• scattering function
• scattering law
• scattering matrix
• scattering medium
• scattering power
• scattering theory
• scheme
• scheme of band heads
• Schiefspiegler telescope
• Schmidt
• Schmidt aplanatic sphere camera
• Schmidt camera
• Schmidt camera optics
• Schmidt-Cassegrain telescope
• Schmidt plate
• Schmidt's tube
• Schmidt system
• Schmidt telescope
• Schottky effect
• Schrodinger's equation
• Schuman-Runge bands
• Schuster-Schwarzschild method
• Schuster-Schwarzschild model
• Schuster's n
• Schwinger radiation
• science
• 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
• scintillation spectrum
• scissoring vibration
• sclera
• sclerotic
• SCNA telluric absorption
• S-component
• scotch mounting
• scotopic luminosity curve
• scotopic vision
• scratch
• screen
• screen brightness
• screen brilliance
• screen efficiency
• screen illumination
• screen image
• screening
• screening constant
• screening effect
• screen intensity
• screw
• screw micrometer
• Sc Seyfert galaxy
• Sc well-developed spiral
• sea
• sealing wax
• search
• season
• seasonal
• seasonal anomaly
• seasonal changes
• seasonal variation
• seat
• second
• second art collision
• second-art transition
• 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
• second of arc
• second of time
• second order Stark effect
• second subordinate series
• second subsidiary series
• section
• sector
• sector acceleration
• sector opening
• secular
• secular aberration
• secular acceleration
• secular contraction
• secular determinant
• 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
• seeing estimate
• seeing fair
• seeing feature
• seeing good
• seeing image
• seeing measures
• seeing monitor
• seeing observations
• seeing phenomena
• seeing phenomenon
• seeing poor
• seeing profile
• seeing shifts
• seeing study
• seeing test
• seeing very bad
• segmented mirror
• Seidel aberration
• seismic detector
• selected
• selected area
• selected equinox
• selection
• selection effect
• selection rules
• selective
• selective absorber
• selective absorption
• selective diffuser
• selective effect
• selective radiator
• selective receiver
• selective sensitivity
• selectivity
• selenium cell
• selenocentric
• selenocentric orbit
• selenodesy
• selenographer
• selenographic
• selenographical
• 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
• sensibility
• sensibilization
• sensitive
• sensitive amplifier
• sensitive bolometer
• sensitive emulsion
• sensitive film
• sensitiveness
• sensitive receiver
• sensitive region
• sensitive to light
• sensitivity
• sensitivity curve
• sensitivity distribution
• sensitivity of system
• sensitivity pattern
• sensitization
• sensitize
• sensitized
• sensitizer
• sensitizing
• sensitometric processing
• sensory system
• separably degenerated
• separation
• separation angle
• separation image
• septet multiplet
• sequence
• sequence of galactic types
• sequence of structural forms
• sequence star
• series
• series discontinuity
• series disintegration
• series limit
• series of observations
• Serrurier truss
• service
• servo
• servomechanism
• servomotor
• servosystem
• servo system
• set
• set of comparison stars
• set of observations
• set rate
• setting
• setting circle
• setting error
• setting motion
• setting on star
• seven-inch transit circle
• sextant
• sextet multiplet
• sextet state
• shade number
• shade tube
• shadow
• shadow-band pattern
• shadow bands
• shadow-band structure
• shadow method
• shadow pattern
• shadow photometer
• shadow transit
• shaft
• Shanghai observatory
• shape
• shape of pulse
• sharp edge
• sharpening
• sharp image
• sharp series
• sharp solar limb
• shearing interferometer
• sheet reflector
• shell
• shell of gas
• shell spectrum
• shell star
• shell structure
• shield
• shielding
• shift
• shininess of the Moon's surface
• ship
• shock front
• shock tube
• shock wave
• shooting star
• short burst
• short dipole
• short duration burst
• 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
• shower
• shower meteor
• shutter
• shutter aperture
• shutter arches
• shutter exposure
• shutter mechanism
• shutter opening
• side
• side effect
• sidelobe
• side lobe
• sidelobe level
• sidelobe response level
• sidereal
• sidereal clock
• sidereal day
• sidereal drive
• sidereal mean daily motion
• sidereal month
• sidereal period
• sidereal period of rotation at the equator
• sidereal rate
• sidereal-rate tracking mechanism
• sidereal rotation
• sidereal rotation period
• sidereal second
• sidereal time
• sidereal time at mean midnight
• sidereal year
• sideriostat
• siderite
• siderolite
• siderostat
• Siding Springs observatory
• Siegbahn unit
• sighting telescope
• sight line
• sight-line velocity
• sigma orbital
• sign
• signal
• signal generator
• signal/noise
• signal/noise performance
• signal-noise ratio
• signal/noise ratio
• signal power
• signal-to-noise
• signal-to-noise level
• signal-to-noise ratio
• signature of metric
• sign convention
• significance level
• significant figures
• sign of the zodiac
• silica
• silicon
• silicon photocell
• silver bromide emulsion
• silver bromide grain
• silver chloride emulsion
• silver-disk pyrheliometer
• silver film
• silver image
• silvering
• silver iodide emulsion
• silverless image
• silver reflectivity
• simple burst
• simple eyepiece
• simple harmonic oscillator
• simple interferometer
• simple lens
• simplified model
• 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
• site
• site group
• site surveys
• site telescope
• site testing
• site tests
• six-color photometry
• six-color system
• six-constant method
• sizable telescope
• size
• size measurement
• size orbit size
• skeletal vibration
• sky
• sky atlas
• sky background
• sky brightness
• sky brightness temperature
• sky darkness
• sky glow
• sky light
• sky monitor
• sky noise
• sky of stars
• sky patrol
• sky-patrol
• sky radiation
• sky spectrum
• sky survey
• slab
• S, Λ-âçàèìîäåéñòâèå
• slap
• slewing
• slewing drive
• slewing-drive assembly
• slewing motion
• slewing motor
• slewing rate
• slew rate
• sliced paraboloid
• slide
• slide carrier
• slit
• slit assembly
• slit image
• slit jaw
• slitless spectrograph
• slit-less spectroscope
• slitless spectrum
• slit mechanism
• slit spectrograph
• slit spectrum
• slit width
• slit-width adjusting screw
• Sloan digital sky survey
• 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
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• small circle
• small diameter source
• smallest detectable signal
• small flare
• small flare event
• small meteor
• small planet
• small-scale motions
• small source
• small telescope
• smart drive
• smeared band
• Smithsonian astrophysical observatory
• smoked glass
• smoothed curve
• smoothing
• smoothing process
• S/N
• Snell's law
• SNO neutrino detector
• SOAR telescope
• socket
• sodium iodide detector
• soft component
• soft developer
• softening of radiation
• soft landing
• soft radiation
• soft X-ray region
• soft X-rays
• SO galaxy
• solar
• solar active region
• solar activity
• solar activity index
• solar antapex
• solar apex
• solar astronomer
• solar atmosphere
• solar attraction
• solar aureole
• solar battery
• solar blind photomultiplier
• solar bombs
• solar burst
• solar calendar
• solar cell
• solar cell array
• solar chromosphere
• solar constant
• solar coordinates
• solar corona
• solar corpuscles
• solar corpuscular stream
• solar cosmic rays
• solar cycle
• solar data
• solar day
• solar deuterium
• solar diagonal
• solar diameter
• solar disk
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