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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