Course: Science Subtest I
Lesson: Astronomy
Topic: The Stars: Patterns and Movement      Page 16 of 18  

As the Earth travels in its orbit around the Sun, different constellations become visible at night. Prominent winter constellations include Orion, Cassiopeia, and Taurus. Summer constellations include Scorpius and Sagittarius.

When Earth is in the position shown for January 1, the dark side of Earth (i.e., the night-time side) is facing the constellations of Taurus and Gemini, as well as Orion (not shown). In summer, when Earth is on the opposite side of the Sun in its orbit, the night-time side faces Capricornus and Sagittarius, among others.