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Constellations pg. 617-620. 1. # of stars? 2. Maps of sky Declination Right Ascension Earth’s spin 3. Constellations Define Names of key ones Asterisms. There are about 6000 named, visible stars in the sky. Astronomy: the oldest science !. Aristotelian view Has the earth and

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Constellations pg 617 620
Constellations pg. 617-620

1. # of stars?

2. Maps of sky

Declination

Right Ascension

Earth’s spin

3. Constellations

Define

Names of key ones

Asterisms



Astronomy the oldest science
Astronomy: the oldest science!

Aristotelian view

Has the earth and

sky on fixed spheres

  • The ancients imagined that the Earth was surrounded by a canopy of stars


The celestial sphere a globe of the sky
The Celestial Sphere:a globe of the sky!

An imaginary bubble that surrounds Earth onto which all the stars are positioned.

Like Earth, the Celestial sphere has a “North Pole”, a “South Pole”, and an equator.


To locate a place on the surface of the earth we use coordinates what is the location of chicago
To locate a place on the surface of the earth we use coordinates.What is the location of Chicago?

Shuffle the deck and have sum fun


Stars, constellations, planets, can be found using the coordinates of declination and right ascension on the celestial sphere.

Locate Cygnus the Swan (looks like a cross)


DEC (declination) coordinates of

DEC is measured from the celestial equator in degrees (similar to __________).

Measurement to the

NORTH is positive. The celestial North Pole is at +90 degrees DEC.

Measurement to the

South is negative.

The South Celestial Pole is

at _______degrees DEC


RA coordinates of (right ascension) is similar to _______ is measured in hours, minutes, and seconds, as if we were measuring time instead of position!

0-24 hrs

RA reads to the EAST.

Astronomers decided to begin RA at the point where the path of the ecliptic crosses the celestial equator: the first day of SPRING.

(vernal equinox)


We see a “flat” image of the stars in the constellations, but the stars are actually located at varying distances from earth.


Is the celestial sphere tipped over
Is the Celestial Sphere tipped over? constellations, but the stars are actually located at


Is the celestial sphere tipped over1
Is the Celestial sphere constellations, but the stars are actually located at tipped over?

It is actually Earth that is at an angle (tipped over at an angle of 23.5°

Ecliptic: the path of the sunthrough the sky


Circumpolar constellations
Circumpolar Constellations constellations, but the stars are actually located at


Why did the north star change precession
Why did the North Star Change? constellations, but the stars are actually located at Precession

  • The Earth is not a perfect circle so it does not have a perfect rotational spin. It “wobbles” like a top.

  • So, Polaris has not always been the “North” Star.


Has Polaris always been our North Star? constellations, but the stars are actually located at


Celestial portraits
Celestial Portraits constellations, but the stars are actually located at

  • Human brains naturally create patterns.

  • What do you see when you look at the clouds?

  • The ancients did the same when they looked up at the sky.


Constellations
Constellations constellations, but the stars are actually located at

  • A name given to a group of stars

  • 88 in all

  • What do you notice about the constellations that follow?

http://www.videojug.com/film/what-is-a-constellation

http://www.youtube.com/watch?v=QXeEAQtC75g


Zodiac constellations
Zodiac Constellations constellations, but the stars are actually located at

The 12 constellations that move through during the year.


Do you see a pattern in these stars? constellations, but the stars are actually located at


Cassiopeia
Cassiopeia constellations, but the stars are actually located at


Corona borealis
Corona Borealis constellations, but the stars are actually located at

The Northern Crown


Draco the Dragon constellations, but the stars are actually located at


Ursa minor little dipper
Ursa constellations, but the stars are actually located at Minor: Little Dipper

The last star in the handle of the Little Dipper is the North Star: Polaris: The North Star

http://www.youtube.com/watch?v=N93WV61ETo8


The big bear
The Big Bear constellations, but the stars are actually located at

Can you find the stars of the Big Dipper in the constellation?


Asterisms
Asterisms constellations, but the stars are actually located at

  • A named group of stars that are part of a larger constellation

  • Example

    • The Big Dipper is part of

      the larger constellation

      Ursa Major


The “tea pot” asterism in the constellation Sagittarius constellations, but the stars are actually located at


You probably noticed constellations tell a story
You probably noticed Constellations Tell a story constellations, but the stars are actually located at

  • Orion was a mythical hero and hunter, and in his amorous pursuit of the Pleiades (the 7 daughters of the giant Atlas), the Gods placed them in the sky. And Orion chases after them in the sky for all eternity.


Your turn
Your Turn! constellations, but the stars are actually located at

  • Look for a pattern, picture, figure, of an object, person, by connecting the stars.

  • Outline the figure.

  • Name the constellation

  • Create a mythological story to go with your constellation


Constellations pg 714
Constellations pg. 714 constellations, but the stars are actually located at

  • 88 constellations in all

  • We still use 48 of the ancient ones and have added 40 new ones

  • 28 are in the northern sky, 48 are in the southern,

  • 12 are the zodiac constellations

  • In the Northern Hemisphere their named for mythology

  • In the Southern Hemisphere they have modern names


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