Prologue

1
Prologue

• Charting the Heavens

2
(No Transcript)
3
(No Transcript)
4
(No Transcript)
5
Cassiopeia
Polaris
Pointer Stars
Little Dipper
Big Dipper
North
6
Andromeda
Cassiopeia
Pegasus
Great Square of Pegasus
West
7
Pleiades
Orion
Aldeberan
Taurus
Betelgeuse
Sirius
Rigel
Canis Major
South
8
Leo Minor
The Sickle
Leo Major
Regulus
East
9
Polaris
North
10
Constellations

• Constellations - a visual grouping of stars
• Asterism - a smaller group of stars
• Stars labelled in order of brightness

11
(No Transcript)
12
(No Transcript)
13
TheCelestial Sphere
14
Measurements

• Right Ascension Declination
• Angular Distances

15
(No Transcript)
16
Solar Periods

• Solar Day
• Sidereal Day

17
Seasons

• Main reason Earth experiences seasons -gt Tilt
  of the Earths axis
• Not due to the relative distance of the Earth
  from the Sun over time.

18
Jan
Jul
(aphelion)
(perihelion)
19
Jan
Jul
Northern Winter Southern Summer
Southern Winter Northern Summer
20
Solstice Equinox

• Summer Solstice
• Winter Solstice
• Equinoxes

21
Seasons

• Two consequences of the Earths Tilt
• Longer days during Summer, shorter during Winter.
• Direct vs. Indirect Rays.

22
Summer Solstice
North
South
23
Summer Solstice
Noon Sun
West
North
South
East
24
Winter Solstice
Noon Sun
West
North
South
East
25
Direct vs. Indirect Rays
26
Summer Solstice
Northern Summer
Direct Rays
Indirect Rays
Southern Winter
27
Winter Solstice
Northern Winter
Indirect Rays
Direct Rays
Southern Summer
28
Parallax