1. ASTR 2310 Chapter 1: Early Astronomy Celestial Sphere Coordinates Motions Time  Solar/Sidereal Time  Calendars Figures used in this presentation are from Horizons by Michael Seeds.

2. ASTR 2310 Celestial Sphere

3. ASTR 2310 Celestial Sphere – sun and special times

4. ASTR 2310 Celestial Sphere – different locations on Earth

5. ASTR 2310 Celestial Sphere – as seen from here

6. ASTR 2310 Celestial Sphere – as seen from here

7. ASTR 2310 Chapter 1: Early Astronomy Coordinates  Right Ascension and Declination  Hours and degrees  References for declination: poles, equator  Reference for RA: Greenwich

8. ASTR 2310 Chapter 1: Early Astronomy Precession – north star and coordinates

9. ASTR 2310 Chapter 1: Early Astronomy Motions – see videos on my blog link Almost all motions by virtue of Earth's motion  Sun, Moon, planets, a bit different  More to come in future chapters

10. ASTR 2310 Chapter 1: Early Astronomy Analemmas

11. ASTR 2310 Chapter 1: Early Astronomy Time  Solar/Sidereal Time Why 4 minutes different – simpler approach  Calendars Julian and Gregorian