ASTR 100 Study Guide - Final Guide: Celestial Pole, Celestial Equator, Semi-Major And Semi-Minor Axes

• School: Ball State University
• Department: Astronomy
• Course: ASTR 100
• Professor: Ryan Bartholomew

Document Summary

Separates celestial objects that are rising from celestial objects that are setting. Passes through all points except the east point on the horizon: zenith. Only at the geographic equator would the celestial equator pass through an observers zenith: geographic equator. Objects in the sky appear to move in circular paths parallel to the horizon here: nadir. Observer will never see stars on the nadir: diurnal motion. Daily rising and setting of objects in the sky. Sun, stars, moon, and planets all cross meridian daily because of this: equator. Each star is above the horizon the time here: tilt between the celestial equator and ecliptic is caused by the 23. 5 degrees tilt of the. Divides the celestial sphere into northern and southern hemispheres. Rotatio(cid:374) of ea(cid:396)th"s a(cid:454)is reaches the celestial sphere to create both of these: north celestial pole. Polaris is called this because it is close to this: south celestial pole.