GUIDING QUESTIONS
1.In this geocentric model the celestial sphere
does not move.
spins around a stationary Earth.
protects Earth by keeping stars Dom drifting too close.
fixes the North Star directly over the observer.
2. The celestial sphere has stars that
are attached and move along with it.
move across the sphere in prescribed tracks.
are free to cycle closer and farther to one another.
predictably move from one constellation to the next.
3. The celestial sphere is tilted such that
all stars can be seen at some point during the night.
all stars can be seen at some point during a year.
the horizon does not interfere with observing stars.
the altitude of the North Star is equal to an observer's latitude.
4. If the observer moved to a more northerly location on Earth, she would
see the exact same stars.
see entirely different stars.
observe the North Star at a different altitude
fall off the Earth.
5. From the center of North America, stars Mat are seen to nse and set are
far from the celestial poles.
the most Mstant from Earth.
found close to theNorth Star.
generally the brigh.st stars.
6. For an no at Earth's north pole Me stars
are only visible for half Me night. nse and set more quickly than for observers at the equator. never nse an se.
all pass directly overhead.
