End of Unit 2 Assignment
This assignment consists of four parts. The first is a review with
a couple of practice questions linked directly to their answers.
The second is a short quiz
that you take using Blackboard. It will be instantly scored for you by Blackboard;
you only get one chance to take it, however, so be sure you are ready! The third
part is an essay question. The question appears below; when you are ready to
answer it, log on to Blackboard and submit your essay. Finally, for each unit,
you should log on to Blackboard and contribute a question, an answer, or a comment
to one of the posted topics.
If you find the material in this unit challenging, you might want to start with
the "discussion" part of the assignment in order to get some help with
some of the ideas.
Brief summary of Unit Two:
Topics we have covered include the definitions of latitude
and longitude and the importance of the Equator, the Prime Meridian,
Date Line, and the poles in this system. We have also covered different
kinds of time, time zones, and the use of the "Earth Clock" to
visualize how these all relate to one another.
Before you go to the quiz, see how you do on these two questions.
If you have trouble, you might want to review the unit, send a question
to the discussion group, or seek help from the instructor.
Practice Question One
City A is located at 30E, 40N and City B is located at 40E, 30N. To
get from A to B, do you go north or south? East or west? Will your
trip be shorter if you first go east or west, then go north or south,
or will it be shorter if you first go north or south, then east or
Practice Question Two
It is 7 am daylight saving time on Monday in California. You are
planning to call your cousin who is in Sydney, Australia. What time
and what day is it where he is? California is in the time zone at 120W
and Sydney is in the time zone at 150E. Explain your answer.
When you are ready, Blackboardand
take Quiz Two.
You will get instant feedback on your score on Quiz Two
(and your instructor will also be informed of your score). If your
score is OK,
you may proceed directly to the Essay Question Two on Blackboard . Otherwise,
you might want to look at what you missed, ask your instructor about
questions you missed, or review relevant parts of the unit.
Explain to someone who does not know any astronomy: Why do we need to have an international date line? What happens when you cross the dateline? If there were an island crossed by the date line, and it was Monday noon for a person on the east end of the island, what date and time would it be for someone on the west end?
When you are ready to answer this question, go
write your answer.
Alternative to the Essay Question
If you have friends who live at least 600 miles east or west of you
who are willing to help out (or already in this class), you may replace
the above Essay Question with this activity:
First, find out when true solar noon happens where
you are. One way to do this is to find out when the shadows are aligned
- see "finding north" in Unit One. A few minutes before solar
noon, contact your friend. Have him or her mark the shadow of a yardstick
on the ground when you say "It's noon here". (It may be easier
to say "In 15 minutes it will be noon here. Mark the shadow exactly
15 minutes from now".) Have your friend measure the length
of the shadow and also estimate its direction as best he can;
or, if he
is really helpful, have him determine the time of noon where
he is and tell you that. Report your results: What direction
was his shadow
when yours was due north? How much time difference was there
between his noon and yours? Did you encounter any surprises or
carrying out this exercise?
Don't forget to contribute to the discussion
on Blackboard on
one of the topics in this unit!