A sidereal day is the length of time that it takes for the Earth to make one full 360-degree rotation around its axis.
(A sidereal day; is; the length of time that it takes) (the length of time; takes; for the Earth to make one full 360-degree rotation around its axis)
A sidereal day the length of time
is takes
the length of time that it takes
for the Earth to make one full 360-degree rotation around its axis