How would you decribe celestial sphere? What is a celestial equator? What determines which stars are visible on a given night?

Name: AY 101 // UA // Lectures 2 + 3
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Lesson 2 // Lectures 2 -The Celestial sphere is an imaginary sphere against which all celestial objects project -The Celestial equator is an imaginary extension of the Earth’s equator against the celestial sphere. This divides the celestial sphere into the north and south celestial hemispheres that both have poles just like Earth. -The horizon (our field of vision) only lets us see half of the celestial sphere at one time. -Stars appear to rise and set, from East to West, relative to the horizon. • The Diurnal path is the apparent path that stars take to go around the Earth. • The Ecliptic is the apparent path of the Sun. -Some stars never appear to rise or set and those are called circumpolar stars. What determines wh