1. The zenith is the point on the celestial sphere that is ? directly over the observer.
2. 90 degree's - Ho = ? zenith distance.
3. At upper transit, if the zenith distance is 34°, the geographical distance from the observer to a body's GP is ? 2040 miles
4. The difference of latitude (1) between the geographic position (GP) and your position, at the time of upper transit, is represented by ? zenith distance
5. Zenith distance is equal to ? 90° - Ho
6. If the Sun's observed altitude is 27°12', the zenith distance is ? 62°48'
7. If the Sun's observed altitude is 47°50', the zenith distance is ? 42°10'
8. If the Sun's observed altitude is 54°30', what is the zenith distance ? 35°30'
9. In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from ? your horizon to your zenith
10. In the horizon system of coordinates what is equivalent to the poles on the Earth ? Zenith, nadir
11. In the celestial equator system of coordinates what is NOT equivalent to the longitude of the Earth system of coordinates ? Zn
12. In the celestial equator system of coordinates, what is comparable to latitude on the terrestrial sphere ? Declination
13. The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the ? declination
14. The small circle of the celestial sphere parallel to the celestial equator, and transcribed by the daily motion of the body, is called the ? parallel of declination
15. The daily path of a celestial body that is parallel to the celestial equator is the ? diurnal circle
16. The path of a celestial body during its daily apparent revolution around the Earth is called its ? diurnal circle
17. In the celestial equator system of coordinates what is equivalent to the longitude of the Earth system of coordinates? Greenwich hour angle
18. The GHA of a star ? increases at a rate of approximately 15° per hour
19. In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates ? Hour circles
20. In the celestial equator system of coordinates what is equivalent to the colatitude of the Earth system of coordinates ? Polar distance
