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J
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K
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L
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M
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1533 "F"
f
F2
Fabry
lens
Fabry-Perot
etalon
sunlit
face
image reduction and analysis
facility
transmission
factor
factor
of proportionality
relative luminosity
factor
of radiation
meteorological
factors
facula
faculae
plage
faculaire
facular
facular
areas
facular
granules
facular
plage
facular
region
fade
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
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
Feinanalyse
Fellgett
advantage
principle of
Fermat
Fermi(-Dirac)
statistics
Fermi
formula
Fermi
process
Fermi
resonance
Fermi-Segre
formula
ferromagnetism
F
F
FFT
fiber
fiber
optics
fibre
fibrilles
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
filar
micrometer
fill
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-gram
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
finding
fine
fine
analysis method
fine-focussed
fine-grain
developer
fine-grain
development
fine-grain(ed)
fine-grain(ed)
image
fine-grain
emulsion
fine
grinding
fine
lobe structure
fine
mottles
fine
splitting
finesse
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
fissionable
fissure
least squares
fit
fix
fixation
time
fixed
antenna
fixed
baseline
fixed
ecliptic
fixed-frequency
array
fixed
jaw
fixed
line
group of
fixed
lines
fixed
mirror
fixed
parabola
fixed
parabolic cylinder
fixed
parabolic reflector
fixed
paraboloid
fixed
reflector
fixed
spherical reflector
fixed
stars
fixed
term
fixed-tiltable
reflector
fixed
wire
fixer
uneven
fixing
rapid
fixing
bath
FK5
flame
flame
spectrum
flaming
aurora
Flamsteed
number
flash phase of
flare
flare
center
flare
ejection
small
flare
event
flare-like
facula
flare
model
frequency of
flare
occurrence
flare(-producing)
region
proton
flare
project
radio emission from
flares
flare
spectrum
flare-spray
flare
star
flare
surge
green
flash
radio
flashes
flash
phase of flare
flash
spectrum
optical
flat
single
flat
arrangement
flat-concave
lens
flat-convex
lens
flat
field
flat
fielding
flat
image
flat
mirror
flat
reflector
flat
screen
flat
spectrum
flattened
spheroid
field
flattener
polar
flattening
flattening
of corona
flattening,
polar
to
flatten
the field
Flexible
Image Transport System
instrumental
flexure
flexure
effects
flexure
of mirror
flexure
of tube
flicker
effect
flicker
frequency
flicker
method
flicker
noise
flicker
photometer
space
flight
Goddard space
flight
center
flight
path
flint
flint
glass
flip
mirror
flocculi
hydrogen
flocculus
working
floor
flotation
system
vortex
flow
radiative
flow
of energy
rate of
flow
of radiation
fluctuate
background
fluctuation
scintillation
fluctuations
fluctuations
in cosmic radiation
fluctuations
in direction
fluctuations
in gain
fluctuations
in intensity
fluctuations
in receiver gain
resonance
fluorescence
fluorescent
fluorescent
screen image
fluorine
fluorit
fluor
spar
total
flux
flux
collector
luminous
(flux)
density
total
flux
density
turnover in
flux(-density)
spectrum
magnetic
flux
in spot
flux
integral
electrostatic
fluxmeter
flux
unit
f-number
focal
focal
arrangement
focal
distance
focal
feed
focal
image
telescope of short
focal
length
focal
plane
focal-plane
shutter
focal
point
focal
position
focal
ratio
focal
reducer
focal
setting
focal
shift
focal
surface
foci