Download Day 1 Notes

Earth’s Place
in the
Universe
Starter- Do on page 181 in the starter
section of your notebook.

Our new unit is Earth’s Role in
Space, where do you think Earth fits
in space? Is it a large or small part
of space? Is it unique to other
aspects of space?

Write a paragraph to explain what
you think is Earth’s role in space.
Astronomy Unit Page 12
Heliocentric
2. Geocentric
3. Retrograde Motion
4. Kepler’s 3 Laws
5. Ellipse
6. Perihelion
7. Aphelion
8. Astronomical Unit
9. Barycenter
10. Galaxy
11. Spring Tide
1.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
Neap Tide
Revolution
Rotation
Nutation
Solar Eclipse
Lunar Eclipse
Perigee
Apogee
Precession
Solstice
Equinox
Early Views of the Solar System
Early man believed
Earth
was the center of the solar
system (geocentric universe)
The Greek philosopher Aristarchus
(312-230 BC)
Sun
was the center of the solar
system (heliocentric universe)
History of Astronomy video

https://www.youtube.com/watch?v=E2yB7hyEVRE
Nicholas Copernicus (1473-1543)
agreed with heliocentric model;
& added
1.
Planets move in circular orbits
around the sun
2.
The Earth spins on its axis
Johanes Kepler wanted to disprove
heliocentric model but suspected
Copernicus was RIGHT!

Johanes Kepler discovered 3
laws of planetary motion:
1.
The Law of the Ellipse: orbit of a
planet is elliptical, not circular
2.
The Law of Equal Areas: a planet
moves faster when close to the sun
and slower the further away it is

Perihelion – point in a planet’s orbit
when it is closest to the Sun

Aphelion – point in planet’s orbit
when it is farthest away from the
Sun
3.
The Law of Orbital Harmony: square of
the orbital period is proportional to the
cube of the planet’s distance from the
sun

Earth’s orbital period is: 365.24219 days

The extra .24219 is why we add an
extra day every 4 years
Galileo (1564-1641)
1st
to observe sky using a telescope
made observations that confirmed
that our solar system is
heliocentric

Sir Issac Newton (1642 – 1727)
Defined the Law of Universal
Gravitation (Gravity)

Concluded that the moon moves
around the Earth

The Solar System consists of:

Planets

Moons

Asteroids

Comets
PLANETS
A planet is a large, round
heavenly body that orbits a star
and shines with light reflected from
the star.
A Natural Satellite or moon is a
celestial body that orbits a planet
or larger body (like Earth orbiting
the sun)
What are the 8 planets?
HINT: My Very Excited Mother Just Sent Us News
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune