In this session, I explore the celestial sphere using the SkySafari simulator. SkySafari, despite being a paid app, allows viewing the whole sky and even orbiting around Earth. Latitude and longitude lines on Earth extend into space as declination and right ascension lines, forming the equatorial coordinate system. The celestial equator acts as the zero point for declination, while the prime meridian’s analogy in astronomy is the vernal equinox, the zero point for right ascension. Right ascension is measured in hours, minutes, and seconds, with each hour equivalent to 15 degrees, helping us track objects in the sky. Using SkySafari, we examine the declination and right ascension of stars, like Markab, and see how these coordinates help locate objects. The North Celestial Pole, near Polaris, and the South Celestial Pole are points where right ascension lines converge. The sky appears to move from our perspective due to Earth’s rotation. I also discuss the ecliptic, the sun’s apparent path, and how planets stay close to it. Using examples, we see how the celestial sphere looks from different latitudes, like the North Pole, equator, and South Pole. Observations from these points illustrate how stars rise and set depending on the observer’s location. Finally, we look at Stellarium, another sky simulation software, to see the celestial sphere from an Earth-bound perspective. The equatorial coordinate system remains consistent, mapping the sky into 88 regions defined by constellations and their boundaries. Stellarium: Sky Safari:.