Final answer:
When looking up, the sky is divided into 4 segments called quadrants.
Step-by-step explanation:
When looking up, we divide the sky into 4 segments. These segments are known as quadrants. The sky is divided into four quadrants in order to facilitate navigation and observation of celestial objects such as stars and constellations. Each quadrant encompasses 90 degrees of the celestial sphere, which is half of the total 180 degrees from the horizon to the opposite horizon.