We’ve been talking about the sun, the moon and their relationships with the Earth.
Have you noticed the days getting shorter? Why do you think this is happening?
Here are a few websites for you to do some research about the shortening days.
http://www.timeanddate.com/worldclock/astronomy.html?n=2222
http://www.calendar-updates.com/sun.asp?PostalCode=08232&Submit=Get+Sunrise+%2F+Sunset+Times
http://www.learner.org/jnorth/sunlight/fall2012/update120112.html