1. (gets faster as it falls)
Falling Apple:
Changing Speed
(gets faster as it falls)
Same Direction
(always falls down)

2. Net Force is Zero, No Net Motion Equal and Opposite
Force from the Table
Force = (apple’s mass)  (acceleration due to gravity)
Net Force is Zero,
No Net Motion

3. Local Sky
Zenith N W E S
Horizon

4. NCP
Visible Half
of the Sky
Below the
Horizon N S Z E W
CEq
SCP

5. Measuring Latitude
Zenith
NCP
CEq N W E S
Latitude
Horizon

7. NCP
Summer
Solstice
Ecliptic
CEq
Winter
Solstice
SCP

8. Autumnal Summer Equinox Solstice Winter Vernal Solstice Equinox NCP
Ecliptic
CEq
Winter
Solstice
Vernal
Equinox
SCP

9. September
June
December
March

10. Equinoxes: March 20 & Sept. 22
Northern Spring/Fall
Southern Fall/Spring

11. December 21: Winter Solstice
Northern Winter
Southern Summer

12. June 21: Summer Solstice
Northern Summer
Southern Winter

13. 1 KW/m2
1 KW/m2
1 m2
2 m2

14. 2000 Dec 21: Winter Solstice
2001 Mar 20: Vernal Equinox
Winter
Spring
Summer
Autumn
2001 June 21: Summer Solstice
2001 Sept 22: Autumnal Equinox
Summer
Autumn
Winter
Spring

15. Cepheus
Draco
Polaris
Ursa Minor
2000 AD
Thuban
2700 BC

16. Precession of the Equinoxes

17. d M1 M2 2d M1 M2
d/2 M1 M2

18. M1 M2 d
2M1 M2 d
2M1
2M2 d

20. Conic Section Curves
Circle
Ellipse
Parabola
Hyperbola

21. Parabola
v = vE
Hyperbola
v>vE
Ellipse
vC<v<vE
Circle
v = vC
Ellipse
v<vC