This long-range periodic climatic pattern can only be explained by invoking astronomical factors, such as the tilt of the Earth's axis which shifts successively the northern, then the southern, hemisphere towards the sun as the Earth orbits the sun each year."
(This long-range periodic climatic pattern; can only be explained; ) (the tilt of the Earth's axis; shifts successively; the northern, then the southern, hemisphere towards the sun as the Earth orbits the sun each year) (the Earth; orbits; the sun; T:each year)
This long-range periodic climatic pattern the tilt of the Earth's axis the Earth
can only be explained shifts successively orbits
the northern, then the southern, hemisphere towards the sun as the Earth orbits the sun each year
the sun T:each year