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1533 "F"

Fabry lens
Fabry-Perot etalon
sunlit face
image reduction and analysis facility
transmission factor
factor of proportionality
relative luminosity factor of radiation
meteorological factors
plage faculaire
facular areas
facular granules
facular plage
facular region
short-wave fade-out
speed of fading
fading effect
fading of echo
Fahrenheit degree
reciprocity failure
the faintest stars
faint galaxy
faint nebula
faint object
faint radio star
faint source
faint star
seeing fair
free fall
falling weight
fall of meteorite
false color image
false dawn
false image
false observations
false zodiacal light
Jupiter's family
family of asteroids
fan ray
fan(-shaped) beam
Faraday effect
Faraday rotation
far field response
far infrared
far-infrared radiation
far-out corona
far outer arm
corona far-out from the Sun
far point of clear vision
far side
lunar farside
far ultraviolet
far-ultraviolet radiation
far-ultraviolet spectrum
motion fast
fast-drift burst
fast electrons
fast focal ratio
fast Fourier transform
fast interferometer
fast meteor
fast motion
fast-motion drive
fast photomultiplier
fast protons
fast scan
fast spectrograph
fast- telescope
visual fatigue
fat zero
rock fault
fault detection
F corona
seeing feature
surface features
wide-band feed
feed antenna feed
feed arrangement
feed assembly
feed dipole
feed element
antenna feeder
feeder arrangement
feeder system
feed horn
feed(ing) optics
feed mast
feed support
feed-support system
feed system
filament feet
Fellgett advantage
principle of Fermat
Fermi(-Dirac) statistics
Fermi formula
Fermi process
Fermi resonance
Fermi-Segre formula
fiber optics
fibrille structure
Besselian (fictitious) year
apparent rotation by refraction of field
field angle
field astronomy
magnetic (field) configuration
field curvature
field distortion
field effect
wide field eyepiece
field flattener
field-flattener lens
field force
field function
field illumination
flat fielding
field instruments
field intensity
field lens
field nebula
field of critical definition
field of good definition
field of high definition
field of telescope
true field of view
field of vision
field pattern
Einstein's field relations
field relations of gravitation
near field response
field spar
field star
field station
field stop
magnetic field strength
wide field telescope
field tests
unified field theory
receiver noise figure
figure of the Earth
significant figures
local figuring
figuring of mirror
solar filament
filamentary nebula
filamentary structure
filament feet
polar crown of filaments
filar micrometer
filled aperture
partial filling
photographic film
film base
film development
film displacement
film distortion
film spool
film-to-film method
Wiener filter
filter attenuation band
filter holder
spatial filtering
filter photometry
filter stop band
filter transmission band
final limits
final stage
zero power finder
finder chart
finder field
finder telescope
fine analysis method
fine-grain developer
fine-grain development
fine-grain(ed) image
fine-grain emulsion
fine grinding
fine lobe structure
fine mottles
fine splitting
inverted fine structure
fine structure constant
finite atmosphere
fire ball
great fireball
first art collision
first-art transition
first contact
first kind collision
Kepler's first law
first magnitude star
first order Stark effect
first point of Aries
first point of Libra
first quarter
first subordinate series
first subsidiary series
nuclear fission
least squares fit