he recognized it as the length of one sidereal day, the amount of time it takes for the Earth to rotate once as measured relative to the fixed stars.
(he; recognized; it; as the length of one sidereal day) (the amount of time; takes; for the Earth to rotate once) (the Earth; to rotate; T:once) (the amount of time it takes; measured; relative to the fixed stars)
he the amount of time the Earth the amount of time it takes
recognized takes to rotate measured
it as the length of one sidereal day
for the Earth to rotate once
T:once
relative to the fixed stars