Thus, while the length of a year is based on the time for the earth to orbit the sun, the length of a month is about the length of time it takes to moon to orbit the earth.
(the length of a year; is based; on the time for the earth) (the length of a month; is; about the length of time) (the length of time; takes; to orbit the earth)
the length of a year the length of a month the length of time
is based is takes
on the time for the earth
about the length of time
to orbit the earth