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Observation
Observation car
Observation deck
observation dome
Observation post
observation station
observation tower
Observational
observational equivalence
Observative
Observator
Observatory
Observe
observed
observed fire
Observer
-- observer's meridian --
Observership
Observing
observingly
obsess
obsessed
Obsession
obsessional
obsessionally
obsessive
obsessive-compulsive
obsessive-compulsive personality
obsessively
obsessiveness
obsessivity
obsidian
Obsidional
observer's meridian
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Noun
1.
observer's meridian
-
a
meridian
that
passes
through
the
observer
'
s
zenith
line
of
longitude
,
longitude
,
meridian
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