2. The Appearance of the Night Sky
Constellations

3. Motions of the Earth in Space
Revolution about the Sun -- Annual
Ecliptic – plane of the Earth’s orbit , apparent path of Sun on sky, the zodiac
Proof – stellar parallax (1838)
Rotation on Axis Daily
Foucault Pendulum 1851

4. The Celestial Sphere
Celestial Equator
Ecliptic
Two intersecting planes -- the 4 cardinal pts – equinoxes and solstices

5. The sky from 3 different position on Earth

6. Origin of the seasons -- tilt of the Earth’s axis

7. Precession

8. Phases of the Moon

9. Rotation of Moon
Synchronous rotation – rotation on axis = revolution about Earth

10. Eclipses of the Sun and Moon
Solar – new moon
Lunar – full moon
Moon must be at one of the nodes of its orbit and the line nodes points to the Sun

11. An Eclipse of the Sun
3 types – total, partial, annular

12. Eclipse of the Moon

13. Next eclipses
Lunar -- Total – Sept 27-28
Solar - partial Sept 13 S. Africa, S. Atlantic
Total Mar. 9 , 2016
Annular Sept. 1, 2016
Aug 21, 2017
April 8, 2024 *
Aug 23, 2044
Aug 12, 2045