Last time, we explored the horizontal coordinate system to locate objects in the sky. Now, let’s dive into how we can organize and identify what we see up there. Using Stellarium, an observatory simulation program, we can identify familiar patterns like the Belt of Orion, Taurus, and the Pleiades (Seven Sisters). To describe these patterns, we use the term “constellation.” For example, Orion’s Belt, surrounded by stars forming a rectangle, depicts the shoulders and feet of Orion. Another type of pattern is an “asterism,” such as the V shape in Taurus or the Belt of Orion. While asterisms can span multiple constellations, both constellations and asterisms are simply patterns we see from our unique vantage point on Earth. Orion’s mythological story, with origins in various cultures, underscores humanity’s connection to the stars. As light pollution erases our view of the night sky, we lose this profound connection. Recognizing constellations and asterisms helps us maintain this link. I’ve used Stellarium to show constellations, their artwork, and how to identify key stars like Aldebaran, Betelgeuse, Rigel, and Sirius. Many star names have origins in Arabic and Greek, a testament to the rich history of astronomical study. In 1922, the International Astronomical Union (IAU) standardized 88 constellations’ boundaries using right ascension and declination. Modern star charts, like those from Sky & Telescope, help us locate these constellations and their main features. For example, Ursa Major, known as the Big Dipper, serves as a guide to understanding constellations’ official boundaries and notable celestial objects within them, like galaxies and nebulae. Free resources like NASA’s Jet Propulsion Laboratory night sky maps can help you get started with stargazing. Using these maps, avoid night blindness by not using your phone’s bright light, and enjoy exploring constellations and asterisms with the naked eye. Keep looking up at the sky and enjoy discovering these celestial wonders!