Transcript Universe. Earth, or how it works

Motion of Earth
https://www.youtube.com/watch?v=I3RBsOQU71g
https://www.youtube.com/watch?v=zJuag32iE6o
https://www.youtube.com/watch?v=4whKTDzX82A
Eric Angat
Teacher
1. Describe the
Sun’s path on
December.
2. Describe the
Sun’s path on June.
September-December Glare
If you have recently driven directly east between
7 to 9 in the morning, as I have, you'll not forget
looking directly into the blinding sun. Driving ...
ARIMER COUNTY, Colo. (CBS4) – The womanwho
drove right into a school bus is talking about what she
saw the moments before impact.
Ashlie Dickerson’s car was wedged under the school
bus. She says she was driving her normal route to
work but she normally doesn’t see a bus in that area.
But when turned onto the typical road she takes she
said she was overwhelmed by sun glare.
“You’ve got sun right there on the horizon, That’s all I
can remember up to the accident,” said Dickerson.
1. Describe the Sun’s path on
January.
The Sun is lower on the horizon
because the Northern Hemisphere is
tilted away from the Sun.
2. Describe the Sun’s path on June.
The Sun is higher on the horizon
because the Northern Hemisphere is
tilted towards the Sun.
Universe. Earth, or how it works
3. How do we know when a year starts
and ends?
4. How are we affected by the
precession of the Earth’s axis?
5. What causes the precession of Earth’s
axis?
6. What does it mean by eccentricity?
7. What caused the ice age in past?
Universe. Earth, or how it works
https://www.youtube.com/watch?v=I3RBsOQU71g
11min
Universe. Earth, or how it works
3. How do we know when a year starts
and ends?
By using the sidereal year or the
time for the earth to make one
complete revolution around the sun,
relative to the fixed stars
By using the passing of the seasons,
solstices, and equinoxes. This is called
tropical year.
sidereal year
the time for the earth to make one complete revolution
around the sun, relative to the fixed stars
http://zebu.uoregon.edu/~imamura/121/lecture-2/annual.html
The passing of the seasons
https://cuscutum.wordpress.com/2012/11/13/persian-calendar-jalalis-calendar/
tropical year
4. How are we affected by the precession of
the Earth’s axis?
The northern star changes over time. Right
now our northern star is Polaris but
someday it will be Vega.
5. What causes the precession of Earth’s
axis?
Precession is caused by the shape of earth
and the gravitational pull of the moon and
the Sun.
6. What does it mean by eccentricity?
Eccentricity refers to how round or how oval
the orbit is (Kepler’s 1st law).
7. What caused the ice age in past?
The change from the minimum tilt to the
maximum tilt. This cycle happens in a
100, 000 year cycle.
http://www.physics.csbsju.edu/astro/newcomb/II.6.html
Size of the Universe
https://www.youtube.com/watch?v=zJuag32iE6o
Size of the Universe
8. A Universe is made up of _____.
A Galaxy is made up of ______. A
Solar system is made up of _____
Choices:
A. star or stars, planets, moons, asteroids
B. galaxies
C. nebulae, clusters, Solar Systems
Why Does Everything In The Universe Spin?
https://www.youtube.com/watch?v=4whKTDzX82A
9. How did the solar system form?
After the Big-Bang-The
solar system formed from
nebula. As the gases
cooled they came
together and spun in
counterclockwise
directions forming stars
and planets and other
celestial objects.
Everything in the universe
spins.
http://hendrix2.uoregon.edu/~imamura/121/lecture-5/lecture-5.html
Solar
year,
365 d.
Sidereal
365
year,
Difference,
5 h.
48
6
9
20
http://www.physics.csbsju.edu/astro/newcomb/II.6.html
m.
46
s.
9
m.
23
s.