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Course Announcements

Homework: “Scale of the Universe”

will be available on-line at the Mastering Astronomy (MA) website (“masteringastronomy.com”) on Thursday • • • •

ASSIGNMENT #1 IS DUE SEPTEMBER 10th, 11 pm.

These awesome presentations are available on my home server, http://evilo.dyndns.org/courses You should take a look at these as you begin to study for Test I.

When is our first test? September 17...that's a Thursday in two weeks.

Did you get the Key Ideas from the Motion Lecture Tutorial?

Imagine you are located in the Northern Hemisphere and see a star directly overhead (zenith). In what direction will you have to look to see this star set?

A) southwest B) west C) northwest D) This star will never set.

You are looking toward the north and see the Big Dipper to the right of Polaris. Fifteen minutes later, the Big Dipper will appear to have moved in roughly what direction?

A) east (to your right) B) west (to your left) C) up (away from the horizon) D) down (closer to the horizon)

How much time is there between when a star rises and when it sets?

A) less than twelve hours B) about twelve hours C) more than twelve hours D) It depends on the star.

So now we understand nightly motion. How about weekly and monthly changes?

You go out tonight and see the brightest star in the constellation Orion just rising above your eastern horizon at 10 PM. One week later at 10 PM this same star will be A) slightly higher in the sky.

B) at the same height as before.

C) below your horizon.

D) setting on your western horizon.

These weekly and monthly changes lead to ...

Astrology:

The belief that the positions of the stars and planets as seen from Earth impact human events.

Science or Pseudoscience?

Your Birth Sign R OUGHLY, it is the constellation that the Sun is covering up during the day you are born if you were born 2000 years ago.

Zodiac -

The 13 Zodiacal constellations that our Sun covers-up (blocks) in the course of one year (

used to be only 12

)   Aquarius Pisces  Aries   Taurus Gemini  Cancer        Leo Libra Virgo Scorpius Ophiuchus Sagittarius Capricornus

Constellations – the 88

semi-rectangular regions that make up the sky  Northern constellations have Latinized Greek-mythology names:  Orion, Cygnus, Leo, Ursa Major, Canis Major, Canis Minor  Southern constellations have Latin names:   Telescopium, Sextans, Pyxsis The actual constellation boundaries were drawn up by Eugène Delporte in 1930 then later approved by the IAU (International Astronomical Union).

Use the

Summer Triangle

to find constellations during summer evenings

Use the

winter triangle

to find constellations during winter evenings

Anyone recognize any shapes here?

SIRIUS

Islamic(ish) Star Names

Betelgeuse Aldebaran Rigel

Sirius

Using Orion in to find other objects

Pleiades

Aldebaran

Pleiades Seven Sisters Subaru

Sirius

Using Orion in to find other objects

Pleiades

Aldebaran

Great Orion Nebula

Use the

Big Dipper

in the northern sky as a way to find other groups of stars

How to find stuff in the sky – Star Charts http://skymaps.com/ http://www.fourmilab.ch/yoursky/cities.html

http://www.astro.wisc.edu/~dolan/constellations/constellationjavalist.html

Tutorial: Seasonal Stars – p. 7

      Work with a partner!

Read the instructions and questions carefully.

Discuss the concepts and your answers with one another.

Come to a consensus answer you both agree on.

If you get stuck or are not sure of your answer, ask another group.

If you get really stuck or don’t understand what the Lecture Tutorial is asking, ask me for help.

Post Tutorial Question

 What component of Earth’s motion causes 〠 the stars to rise earlier on successive nights?

A) its rotation about its axis B) its orbit around the Sun C) the tilt of its rotation axis

Post Tutorial Question

 One night, you see the star Sirius rise at exactly 7:36 PM. The following night it will rise A) slightly earlier.

B) at the same time.

C) slightly later.

Post Tutorial Question

 One evening at midnight, you observe Leo high in the southern sky at midnight. Virgo is to the east of Leo and Cancer is to the west. One month earlier, which of these constellations was high in the southern sky at midnight?

A) Leo B) Virgo C) Cancer

GO CONFIDENTLY

(To the Physics Lab)

IN THE DIRECTION OF YOUR DREAMS!! LIVE THE LIFE YOU’VE IMAGINED