Twinkling of Stars | Motion of the Sky | Seasonal Changes in the Constellations
						4. Seasonal Changes in the Constellations 100 points
							This task requires two observations separated by several weeks. You should make the observations from the same place at the same time (make sure to correct for Daylight Savings Time if your observations are made on either side of the switch!). Simply sketch a wide part of the sky which contains some constellations that you recognize. Make a sketch of this same piece of sky several weeks later. Use some landmark on the horizon to ensure that you are looking in the same direction both times. Due to the Earth's motion around the Sun all the stars in the sky rise four minutes earlier each day. Over several weeks you will be able to see these four minute intervals add up to a significant displacement in the sky. Guiding Questions: Compare your observations. Have the stars moved closer to the eastern or western horizon? Is this what you expect? Why can't we see the winter constellations at night in the summertime?  Where are the winter constellations in the summertime? What fraction of a year is the interval between your two observations? What fraction of the sky have the stars moved across?