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In this session, I’m going to explore star positioning and angular separation using the equatorial coordinate system. This system helps us navigate the celestial sphere, which is an imaginary dome where stars appear fixed, even though they move over time. Using a DSLR camera, I captured stars in a dark sky to illustrate that stars are in different positions. To map these positions, we measure angular separation using simple tools like our hands. For instance, a fist held at arm’s length covers about 10 degrees, while a pinky finger covers about 1 degree. I introduce the equatorial coordinate system, which uses the celestial sphere, an imaginary sphere around Earth. This system incorporates concepts like the celestial equator and poles. Stars seem fixed on the celestial sphere, but this is a helpful fiction for mapping. Angular measurements can be broken down into degrees, arc minutes, and arc seconds for precision. One degree equals 60 arc minutes or 3,600 arc seconds. These tiny measurements help us pinpoint star positions effectively. Star trails, captured through long-exposure photography, visually demonstrate the celestial sphere concept. The stars appear to rotate around a central point, the celestial pole. The altitude of Polaris, the North Star, helps determine your latitude on Earth. The celestial sphere and the equatorial coordinate system provide a useful framework for observing and mapping the night sky. Next time, we’ll delve deeper using sky simulation tools like Stellarium and SkySafari. Credits: Juan Carlos Casado: https://twanight.org/gallery/star-tra... Matthew Saville: https://fstoppers.com/profile/matthew...