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forced bi
noun
bi-elliptic transfer
noun
(astronautics)
A
type
of
movement
of
a
spacecraft
from
one
orbit
to
another,
in
which
the
spacecraft
first
raises
its
apoapsis
to
an
extremely
high
altitude,
then,
at
the
new,
higher,
apoapsis,
performs
an
engine
burn
to
change
its
periapsis
to
that
of
the
desired
orbit,
and,
finally,
upon
reaching
the
new
periapsis,
performs
a
third
burn
to
lower
the
eccentricity
of
its
orbit
and
circularize
in
the
desired
orbit,
or
performs
these
steps
in
reverse
to
move
from
a
higher
to
a
lower
orbit.
bis key
noun
(music)
A
key
using
alternative
fingerings
for
certain
notes
on
woodwind
instruments.
Specifically,
a
key
that
is
located
between
the
first
and
second
keys
operated
by
the
left
hand
on
a
saxophone.
Pressing
LH1
and
the
bis
key
simultaneously
results
in
the
sounding
of
a
Bb.
This
is
especially
useful
when
playing
in
keys
with
many
flats.
bi now, gay later
proverb
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