Lecture 06: Daily and Annual Motions
Why do celestial objects appear to rise and set every day? How does this \ndepend on where you are on the Earth, or the time of year? In today's lecture\nwe we set the heavens into motion and review the two most basic\ncelestial motions. Apparent Daily Motion reflects the daily rotation of\nthe Earth about its axis. Apparent Annual Motion reflects the Earth's\nannual orbit around the Sun. We introduce the Ecliptic, the Sun's\napparent annual path across the Celestial Sphere, and note four special\nlocations along the Ecliptic: the Solstices and Equinoxes. This sets\nthe stage for many of the topics of the rest of this section. Recorded\n2007 Sep 26 in 1000 McPherson Lab on the Columbus campus of The Ohio\nState University.