The films shows the typical sky of different seasons above Beijing after the sundown, the ground is covered with black night, stars are glittering and lightening the ground till the day break. In early time, the people noticed that the stars grouping by three or five formed beautiful designs. Hence, the people divide the stars in the sky into different areas called constellation. At present, the international astronomical circle adopts the list of 88 official constellations. Due to the revolution and rotation of the earth, we find that the positions of constellations in the sky are changing, they will rise and go down everyday, besides, the starry sky at the same sky in different seasons are different.