Download PPT Seasons

Why do we have seasons?
Fold your paper into a Frayer model:
4 equal rectangles
The tilt of Earth’s axis causes seasons
Earth’s axis is tilted about 23.5 °
 The sun shines directly on the northern hemisphere
in June
 The sun shines directly on the southern hemisphere
in December
 That's why the seasons are different in each
hemisphere! (CLICK HERE)
 In the spring and fall, the sun shines fairly straight
on the equator, giving both hemispheres equal
warming.
Let’s ‘ANIMATE’ season changes
McGraw Seasons Navigator
SUMMER
Sp
WINTER
SEASONS
SPRING
Vernal Equinox: “equal night”
Sun is at the equator
March 21 (ish)
Both hemispheres receive
‘about’ the same amount of light
FALL
SUMMER
Summer solstice: “sun stands still”
Sun is at the most northern point
of our planet
June 21 (ish)
Sun is highest in the sky
More light hours
WINTER
Su
Sp
SEASONS
SPRING
Vernal Equinox: “equal night”
Sun is at the equator
March 21 (ish)
Both hemispheres receive
‘about’ the same amount of light
FALL
SUMMER
Summer solstice: “sun stands still”
Sun is at the most northern point
of our planet
June 21 (ish)
Sun is highest in the sky
More light hours
WINTER
Su
Sp
SPRING
Vernal Equinox: “equal night”
Sun is at the equator
March 21 (ish)
Both hemispheres receive
‘about’ the same amount of light
SEASONS
FALL
Autumnal Equinox: “equal night”
Sun is at the equator
F
September 21 (ish)
Both hemispheres receive ‘about’
the same amount of light
SUMMER
Summer solstice: “sun stands still”
Sun is at the most northern point
of our planet
June 21 (ish)
Sun is highest in the sky
More light hours
WINTER
Su
Sp
SEASONS
SPRING
Vernal Equinox: “equal night”
Sun is at the equator
March 21 (ish)
Both hemispheres receive
‘about’ the same amount of light
W
FALL
Winter solstice: “sun stands still”
Autumnal Equinox: “equal night”
Sun is at the most southern point of
Sun is at the equator
our planet
December 21 (ish)
Sun is lowest in the sky
Less light hours
September 21 (ish)
F
Sun Both hemispheres receive
‘about’ the same amount of light
Earth’s orbit is NOT a perfect circle!
Earth orbits the sun in an ELLIPSE (oval)
Perihelion: The day that earth is closest to
the sun
Perihelion: January 2 (ish)
Aphelion: The day that earth is farthest
from the sun
Aphelion: July 3 (ish)
Common Misconception
People often think that when Earth is
closer to the sun, it is SUMMER.
Look at this: EARTH’S ORBIT
Credit to…(found from NetTrekker)
1) http://www.footprints-science.co.uk/
flash/seasons.swf
2) http://highered.mcgraw-hill.com/olcweb/cgi/
pluginpop.cgi?it=swf::800::600::/sites/dl/free/00724
82621/78778/Seasons_Nav.swf
3) http://www.windows.ucar.edu/tour/link=/physical_
science/physics/mechanics/orbit/perihelion_aphelio
n.html&edu=high
Why do planets have seasons?
1. Why do planets have seasons?
When a planet is closer to the sun, it will experience summer. When a planet is farther from the sun, it will experience winter.
b. The tilt of a planet creates seasons because it receives direct or indirect sunlight.
c. A planet experiences seasons as it rotates on its axis.
d. A planet experiences seasons as the moon revolves around it.
a.
2. The location at which Earth is closest to the sun is called
perihelion.
b. aphelion.
c. vernal equinox.
d. summer.
a.
3. The location at which Earth is farthest from the sun is called
perihelion.
b. aphelion.
c. summer solstice.
d. winter.
a.
4. Both the northern and southern hemispheres receive approximately 12 hours of daylight and 12 hours at what time?
vernal equinox and autumnal equinox
b. summer solstice and winter solstice
c. vernal equinox and summer solstice
d. autumnal equinox and winter solstice
a.
5. Which of the following statements is NOT true?
a. The sun is highest in the sky during the summer solstice.
b. The sun is lowest in the sky during the winter solstice.
c. The sun is at the equator during the autumnal equinox.
d. The sun is highest in the summer equinox.