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Reflecting circle
Meaning
Noun
●
An
astronomical
instrument
for
measuring
angles
, like the
sextant
or Hadley's
quadrant
, by the
reflection
of
light
from two
plane
mirrors
which it
carries
, and
differing
from the
sextant
chiefly
in having an
entire
circle.
Sourced from
Wiktionary
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