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259 �� "U"

��	U-B
	U-B color index
	U burst
��	U, B, V
��	UBV
	U, B, V magnitude
	UBV photometric system
	UBV-photometry
	UBV-��
	U Geminorum stars
	UK infrared telescope
	UK Schmidt telescope
	ultimate lines
raies	ultimes
vacuum	ultraviolet
	ultraviolet absorption
	ultraviolet astronomy
	ultraviolet data
	ultraviolet emission
	ultraviolet excess
	ultraviolet image
	ultraviolet light
	ultraviolet plate
	ultraviolet radiation
	ultraviolet range
	ultraviolet rays
extreme	ultraviolet region
	ultraviolet spectrum
	ultra-wide angle eyepiece
	U-magnitude
sunspot	umbra
	U-measure
	unaided eye
	unbound electron
	uncertainty
	uncertainty of measurement
	uncertainty of observation
	uncertainty principle
spin	uncoupling
	under bad seeing
	under conditions of weightlessness
	underdeveloped
	underexposed
region of	under-exposure
	underexposure
	under good seeing
	under observation
	under-sampling
	undisturbed
	undisturbed photosphere
	undisturbed photospheric region
	undisturbed Sun
	undriven camera
	undulation
	uneven development
	uneven drying
	uneven emulsion
	uneven fixing
	un-filled aperture
	unfilled aperture
	unfilled aperture antenna
technique of	unfilled apertures
	unidentified band
	unidentified radio star
	unidentified source
	unified field theory
	uniform development
	uniform diffuser
	uniform model universe
	uniform motion
	uniform sidereal time
	unilluminated hemisphere
	unilluminated side
International Astronomical	Union
	unionized
	unionized hydrogen
	unipolar
	unipolar group
	unipolar magnetic region
	unipolar spot
	unipolar sunspot
solar neutrino	unit
	unit angle
	unit brightness
column of	unit cross sectional area
	united atom
	United States Naval observatory
	unit for Zeeman effect
electron density per	unit length
	unit power finder
	unit weight
law of	universal gravitation
	universal instrument
	universal time
visible	universe
	universe as a whole
	universe in the large
Association of	Universities for Research in Astronomy
Mount John	University observatory
	unmanned artificial satellite
	unperturbed orbit
	unpolarized
	unpolarized burst
	unpolarized component
	unpolarized continuum
	unpolarized light
	unpolarized radiation
	unresolved
	unresolved bands
	unresolved lines
	unresolved sources
	unsensitized emulsion
	unsharp masking
	unstable
	unstable equilibrium
	unstable state
	unsteady image
	unvignetted
	unvignetted field
	unwanted signal
to set	up
	uplands
	upper atmosphere
	upper chromosphere
	upper conjunction
	upper culmination
	upper end of tube
	upper level
	upper polar(-axis) bearing
	upper transit
	upright image
	uranium
W	Ursae Majoris star
receiver	using Dicke switch
	UT
��	uvby
	uvby photometric system
	uv plane
	UV-ray picture
	uv-��
	UWA eyepiece
	UWA-��
(��) ��	U ��
��	U , �
�� (��)	U, �
�� (��) ��	U, �,
(��) ��	U, �, V
	U-��
	U-��
	U-��

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