Class 9, ICA #8, September 14.

We did 2 clicker questions that were checks
of the reading, and then a workbook exercise.
There were 6 clicker questions total.

There were 10 total marks possible.  You get 1 mark
for answering, 1 more mark for answering correctly. 
(I didn't count #6.)

The clicker questions count for a total of 3 points toward your
course grade, so your points for the day = # of marks * (3/10).






Clicker Question #1:

The seasons are caused by

C. Earth's axis being tilted with respect to its orbit.


Clicker Question #2:

When it's winter here, in Australia it is.

C. Summer.




Clicker Question #3 -- Prather et al. page 87 question 1:

C. south.



Clicker Question #4 -- Prather et al. page 87 question 2:

A. increases.



Clicker Question #5 -- Prather et al. page 87 question 3:

E. never.





Clicker Question #6:

How many circumpolar stars in the night sky make it to
zenith, do you think?

C. Very few of them.




Solutions to all the question from pages 1 and 2 in Prather:

1. Imaginary plane. But you definitely can't see below the horizon.

2. No. Really what's happening is that the bulk of Earth is
in your way. Earth itself is what stops you from seeing something
that's below the horizon.

3. A4 is unobservable.

4. rising.

5. setting. 

6. 3.

7. none.

8. student 2 is right, student 1 is wrong.

10. A2 due south and moderate to high.
A3 due west, low.
A4 not visible.
B1 northeast quadrant, moderately high up.
B4 due north, low.

11. B never sets.