Astronomy 1020-HSpring_2015

Day-5Stellar Astronomy

Scientist Question• Einstein - 7 • Tesla, Hawking – 3• Darwin, M. Curie – 2• Newton, Copernicus, Galileo, Beatrix

Potter, Hippocrates, Freud, Sagan, Grace Hopper, Kent Weeks, Michio Kaku, (Jimmy Neutron), and Tyler’s choice.

Course Announcements• Smartworks Chapter 1: Start on –

Grades will be downloaded sometime this weekend.

• SW-2 … hop to it.

Patterns• We use patterns in our daily lives.• Sunrise, sunset, moon rise, rainy season …• Passage of time is important to humans.• We can use the stars to help.• There are 88 constellations in the modern

sky.• Semi-rectangular, recognized by the IAU.• Northern : Latinized Greek-mythology names:

• Orion, Cygnus, Leo, Ursa Major, Canis Major

• Southern : Latin names:• Telescopium, Sextans, Pyxsis

Use Winter Triangle to find constellations during evenings

Celestial Sphere

Image a spinning Celestial Sphere surrounding Earth in thinking about the position and motion of the sky

Coordinates

Celestial Sphere

Celestial Sphere Rotation

Celestial Sphere Rotation

Celestial Sphere

Star A

Star B

1

1

3

2

2

4

4

3

Figure 2

Horizon

Is the horizon shown a real physical horizon, or an imaginary plane that extends from the observer and Earth out to the stars?

Can the observer shown see an object located below the horizon?

Is there a star that is in an unobservable position?

When a star travels from being below the observer’s horizon to being above the observer’s horizon, is that star rising or setting?