1. The two points on Earth intersected by its axis of rotation are known as the __________ and _____________________ .

2. What is the name of the line drawn on Earth dividing it into two equal halves, north and south?

3. Great circles are circles that pass through the North and South Poles on Earth. The Earth is divided into 24 equal parts east to west along its equator. The angle between any two of these circles is _____ hour or _____ degrees.

4. Any two points on the surface of Earth that are located on one of these great circles and is located in the same hemisphere will have the same __________ .

5. All points on the surface of Earth that have latitude circles that are not zero are known as __________ circles.

6. What is the latitude of the north geographic pole? __________ degrees

7. What is the longitude of the north geographic pole? __________ degrees

8. Which coordinate in the equatorial coordinate system is like longitude in the geographic coordinate system?

9. Which coordinate in the equatorial coordinate system is like latitude in the geographic coordinate system?

10. Which coordinate in the horizon coordinate system is similar to longitude in the geographic coordinate system?

11. Which coordinate in the horizon coordinate system is similar to latitude in the geographic coordinate system?

12. What units are used to measure the coordinates of right ascension (R.A.)?

13. What direction in the sky is the coordinate of R.A. measured?

14. What is the range in values of right ascension?

15. What is the name of the point in the sky that defines the secondary circle in the equatorial coordinate system?