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1701 "S"

• 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
•