With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Due
to
the
precession
of
Earth
's
rotational
axis
,
Thuban
was
the
naked-eye
star
closest
to
the
north
pole
from
3942
BCE
,
when
it
superseded
Iota
Draconis
as
the
Pole
Star
,
until
1793
BCE
,
when
it
was
superseded
by
Kappa
Draconis
.
Due:O
to:O
the:O
precession:O
of:O
Earth:other-astronomything
's:O
rotational:O
axis:O
,:O
Thuban:other-astronomything
was:O
the:O
naked-eye:O
star:O
closest:O
to:O
the:O
north:O
pole:O
from:O
3942:O
BCE:O
,:O
when:O
it:O
superseded:O
Iota:O
Draconis:other-astronomything
as:O
the:O
Pole:other-astronomything
Star:other-astronomything
,:O
until:O
1793:O
BCE:O
,:O
when:O
it:O
was:O
superseded:O
by:O
Kappa:other-astronomything
Draconis:other-astronomything
.:O