They move around as the Earth moves around the Sun and as the tilt of the Earth's axis moves.
(They; move; around; T:as the Earth moves around the Sun and as the tilt of the Earth's axis moves) (the Earth; moves; around the Sun and as the tilt of the Earth's axis moves)
They the Earth
move moves
around T:as the Earth moves around the Sun and as the tilt of the Earth's axis moves
around the Sun and as the tilt of the Earth's axis moves