Revolution: If the student observes a star for several weeks, he can observe the effects of the revolution (orbiting) of the Earth about the Sun.
(the student; observes; a star for several weeks) (he; can observe; the effects of the revolution (orbiting) of the Earth about the Sun) (the revolution; orbiting; )
the student he the revolution
observes can observe orbiting
a star for several weeks
the effects of the revolution (orbiting) of the Earth about the Sun