A sidereal day is that period in which the earth rotates once on its axis.
(A sidereal day; is; that period in which the earth rotates once on its axis) (the earth; rotates; T:once; L:on its axis; T:that period)
A sidereal day the earth
is rotates
that period in which the earth rotates once on its axis
T:once L:on its axis T:that period