Lecture 6ASTR 111 – Section 002

The contents of Section 3 (Gravitaiton and the Waltz of the planets)

are identical to that from the notes for Lecture 5

I will still post the solutions for the lecture questions after class

• Mars goes retrograde later in the week (Exact on the 15th, 3:24 am EST), but many are already sensing a cosmic winding down. Mars is in the water sign Cancer, an intiating cardinal sign, but one that takes stealthy sidesteps forward, feeling out every situation. In retrograde, Mars stews in his emotional juices, so to speak, and it may be harder to get things done. Some might experience less energy, quick tempers, irrational arguments and defensive overreacting. Mars here amplifies Cancer's protective instinct, which brings out both compassion for all of humanity, and its shadowy twin, clannish "us against them" rationales. It's a chance to integrate feeling into actions, and possibly a series of lessons in anger management.

http://astrology.about.com/b/2007/11/12/mars-retrograde.htm

http://www.physorg.com/news172739274.html

“This 34 by 20-degree wide image provides us with a view as experienced by amateur astronomers around the world.”

How would you describe the size of this object to someone who does not know about degrees as a measure of size? For example, how many moons wide is this section of the sky?

Outline

1. Exam 1 Discussion

2. Quiz Discussion

3. Gravitation and the Waltz of the Planets – through section 4.3 of text

First Exam

First Exam

• 9/29 (one week from today).• Based on lecture notes, problems worked in

lecture, and quizzes. (Chapters 1 through 4.??? have more details on these subjects.)

• Approximately 50 questions.• In the Testing and Tutoring Center in Sub II

(Student Union Building II)• Exam will be administered via Blackboard

system.

Depends on what is covered on Thursday

First Exam

• On 9/29, I will review from 9:00 am until about 10:00 am.

• There will be a quiz on the material covered today and Thursday that is due at 9:00 am on 9/29.

• You may take the exam anytime between– 8 am and 7 pm on Tuesday, September 29th

– and 9 am to 6 pm on Wednesday, September 30th

No make-up exams are given

Innovation Hall

Student Union Building II

Testing and Tutoring Center is through here (first floor of Sub II)

Observing Sessions

• 16" Dobsonian• 2 Meade 12" SCTs• 2 telescopes from Mason's original

observatories• Tuesday 29 September 2009: Start Time ~7:30 PM. • Tuesday 6 October 2009: Start Time ~7:15 PM. • Tuesday 20 October 2009: Start Time ~7:00 PM. • Tuesday 3 November 2009: Start Time ~5:45 PM. • Tuesday 17 November 2009: Start Time ~5:30 PM. • Tuesday 1 December 2009: Start Time ~5:30 PM.

http://physics.gmu.edu/~hgeller/observing.html

Meet in lobby of Research I Building (enter here)

Outline

1. Exam 1 Discussion

2. Quiz Discussion

3. Gravitation and the Waltz of the Planets – through section 4.3 of text

Quiz 3

• Average was 83% 

Quiz 3 questions

• Can you tell me where exactly the testing center is at Mason. Do we have to bring anything with us when we go take the exam?

• How do we take the test?

• If I happened to miss one quiz, what would the ramifications be on my grade?

Quiz 3 questions

• Did you have a good weekend Professor? :) • How are you today?   • have you been enjoying the weather

recently? • Would you be willing to simply give me all

the awnsers to all the exams we are taking this semester beforehand? I feel it would really help my studying?

• what's your favorite planet? mine's the sun! always has been...  

Quiz 3 questions

• I need explanations on questions 8, 9, and 15. i really did not understand them.

• question 8 and 14

• Can you please go over question 4 on this quiz during class?

• question two confuses me when you say in qs 3 that its dec 21st?

I’ll post solutions to this quiz before the exam

Quiz 3 questions

• i am also having a big problem when you see the moon at equator   • at what time will you see the 1st moom rise from earth?   • When the moon is visible from the equator   • can we go over phases of the moon again before the exam? • questions about seeing the moon at the equator both full moon and

new moon • Could you please explain the rotation of the moon again? I'm

confused on the girl rotating and what part of the moon we see and don't see.

• I dont understand all these questions about the equator.   • I'm not sure of why the of the observer relative to the equator matters

for moon phases. • I'm kind of confused on the perspective of the moon from the equator • do lunar eclipses create a shadow effect? • COnfusing lecture regarding the phases of the moon.  

I’ll review the moon in its orbit on Tuesday, 9/29 (the day of the first exam)

Quiz 3 questions

• do you mind saying something about people talking during lectures, they … were very distracting.

http://therawfeed.com/pix/shut_up.jpg

Quiz 3 questions

• Does the plane that the moon is rotating on ever change or is it at a constant degree? because that would change things...  

• Could you review the phases of the moon one last time before the test.  

Quiz 3 questions

• Do you know of a good tutor? http://www.physics.gmu.edu/wiki/Clubs:Physics_Club:Tutoring

• When are your office hours? I am so lost!   After class or by appointment.

Outline

1. Exam 1 Discussion

2. Quiz Discussion

3. Gravitation and the Waltz of the Planets – through section 4.3 of text

Reading

• Chapter 4 through section 4.3

• These slides are in the notes for Lecture 5.