Aim: The Sun’s path each
Season?
Do Now:
- In your notes what two factors help
create the seasons.
- Then, explain what these two factors
are.
Tilt and Revolution
I. Celestial Sphere
•Celestial Sphere – an imaginary “dome” around
the planet with celestial objects attached to it.
- Zenith – directly above an observers
head.
• Celestial objects are
seen in the sky but
are not in our
atmosphere.
II. Celestial motion
Why do these objects appear to
rise in the East and set in the
west?
• Objects appear to rise in the east and set in the
west and move counterclockwise along curved
paths.
- Polaris is at the
center of these
curved paths.
• In the Northern
Hemisphere,
celestial objects
appear to move into
the Southern Sky.
Time elapsed photography of stars from Hawaii.
** The noon sun is highest in
summer and lowest in winter.
This is why days are longer in the
summer
Take a worksheet from the
back bottom bin.
You can use this worksheet to
take notes on the next couple
of slides or you can write the
notes in your notebook and
use the worksheet to
study/practice the drawings..
III. The Seasons
• Winter: (tilted away from the sun)
– Winter Solstice December 21st
– Sun is directly over head at the Tropic Of Capricorn
(23.50 S)
– Shortest Day Light Hours (about 9 hours)
W
S
N
E
• Summer: (tilted towards the sun)
- Summer Solstice June 21st
- Sun is directly over head at the Tropic of Cancer
(23.50 N)
- Longest Day Light Hours (about 15 hours)
W
S
N
E
• Spring and Fall: (Equator in-line with sun)
– Spring Equinox (March 21st) and Fall Equinox
(September 21st)
– Sun directly over head at the Equator (00)
– Equal number of day light and night time hours.
W
S
N
E
W
S
N
E
IV. Moving Shadows
The length and position of a shadow
depends on the time of day.