The tilt of the Earth's axis which now is about 23.5 o , ranges from 21.5 to 24.5 o , with each cycle lasting about 41,000 years.
(the Earth's axis; is; T:now) (The tilt of the Earth's axis; ranges; from 21.5 to 24.5 o) (each cycle; lasting; about 41,000 years)
the Earth's axis The tilt of the Earth's axis each cycle
is ranges lasting
T:now
from 21.5 to 24.5 o
about 41,000 years