検索結果- 英語 - 英語
検索内容:
dipleidoscope
noun
(astronomy)
An
instrument
for
determining
the
time
of
apparent
noon.
It
consists
of
two
mirrors
and
a
plane
glass
in
the
form
of
a
prism,
so
that,
by
the
reflections
of
the
sun's
rays
from
their
surfaces,
two
images
are
presented
to
the
eye,
moving
in
opposite
directions,
and
coinciding
at
the
instant
the
sun's
centre
is
on
the
meridian.
