Quiz 1

1. Quiz 1

2. 1. When must quizzes be completed?1. By 9:00 am on Tuesdays2. Never, the quizzes are optional3. Near equinox4. Near solstice5. Only before 0 BC

3. 1. When must quizzes be completed?1. By 9:00 am on Tuesdays2. Never, the quizzes are optional3. Near equinox4. Near solstice5. Only before 0 BC

4. 2. • Do you need to take the lab (ASTR 112) associated with this lecture course (ASTR 111)1. For most majors the answer is yes. If you are unsure, you should see your academic adviser!2. The lab is optional for all majors3. Only astronomy majors need to take the lab4. Only non-astronomy majors need to take the lab

5. 2. • Do you need to take the lab (ASTR 112) associated with this lecture course (ASTR 111)1. For most majors the answer is yes. If you are unsure, you should see your academic adviser!2. The lab is optional for all majors3. Only astronomy majors need to take the lab4. Only non-astronomy majors need to take the lab

6. 3. • What is the policy on make-up exams1. Make-up exams are not given.2. Make-up exams are given if the student notifies the instructor one week in advance3. Make-up exams are given at the end of the semester4. Make-up exams are given when a break-up was involved.

7. 3. • What is the policy on make-up exams1. Make-up exams are not given.2. Make-up exams are given if the student notifies the instructor one week in advance3. Make-up exams are given at the end of the semester4. Make-up exams are given when a break-up was involved.

8. 4. • Not graded

9. 5. • Where is your zenith?1. Pointing directly up2. Pointing directly down3. Pointing towards the sun4. Pointing towards the horizon5. Pointing towards the ground

10. 5. To find the zenith for a point on the surface of the earth in a drawing, draw a line perpendicular to the surface and extend it out into space. Or, draw a line from the center of Earth through the point on the surface and then extend it out into space. • Where is your zenith?1. Pointing directly up2. Pointing directly down3. Pointing towards the sun4. Pointing towards the horizon5. Pointing towards the ground

11. Related Questions A B C D In the figure, the sun is to the right and an observer is standing on Earth at the position indicated by the light blue dot. Which arrow points along the observer’s zenith?

12. 6. • What is another way of saying "the moon subtends 0.5 degrees in the sky"1. The extent of the moon in the sky is about 30 arcminutes.2. The moon is big3. The moon takes about 60 arcseconds to rise.4. The extent of the moon in the sky is about 30 arcseconds.5. The moon takes about 60 arcminutes to rise.

13. 6. • What is another way of saying "the moon subtends 0.5 degrees in the sky"1. The extent of the moon in the sky is about 30 arcminutes.2. The moon is big3. The moon takes about 60 arcseconds to rise.4. The extent of the moon in the sky is about 30 arcseconds.5. The moon takes about 60 arcminutes to rise.

14. Related Questions • From sunrise to sunset, how many degrees does the sun subtend? • If the moon subtends ½ of a degree in the sky, how much does the sun subtend?

15. 7. • In the following image, what is the angle subtended by the moon at apogee in degrees? http://antwrp.gsfc.nasa.gov/apod/ap071025.html • 1. 0.498 degrees2. 69.17 degrees3. 0.0083 degrees4. 29.87 degrees5. 33.89 degrees

16. 7. • In the following image, what is the angle subtended by the moon at apogee in degrees? http://antwrp.gsfc.nasa.gov/apod/ap071025.html 1. 0.498 degrees2. 69.17 degrees3. 0.0083 degrees4. 29.87 degrees5. 33.89 degrees

17. 8. • In class I noted that if the sun was the size of a bowling ball, then Earth would be the size of a very, very small pea. In your own words, make up a memorable analogy that will help you remember the relative size of Earth to the sun. That is, say something like "If the GMU campus were the size of the sun, then ..." or "If the sun was the size of my brother's head, then ..." Note that the diameter of the sun is about 100 times that of Earth.

18. 8. • In class I noted that if the sun was the size of a bowling ball, then Earth would be the size of a very, very small pea. In your own words, make up a memorable analogy that will help you remember the relative size of Earth to the sun. That is, say something like "If the GMU campus were the size of the sun, then ..." or "If the sun was the size of my brother's head, then ..." Note that the diameter of the sun is about 100 times that of Earth.

19. 9. • How many arcseconds are in 60 arcminutes?1. 1 arcsecond2. 60 arcseconds3. 0.0002777 arcseconds4. 3600 arcseconds5. 45 arcminutes

20. 10. • An arcsecond is a measure of 1. angle.2. the time between successive orbital positions. 3. length along a circle 4. the time between oscillations of a standard clock.

21. 11. • One astronomical unit is defined as the 1. distance from which Earth-Sun distance will subtend an angle of one arcsecond. 2. mean distance between the Sun and the Earth.3. distance traveled by light in one parsec4. distance traveled by one astronaut at the speed of light.5. distance traveled by light in one year.

22. 12. • In class, we measured the angular separation between two dots on the screen. Would your measurement of the angular separation change if you moved from the front row to the back row?1. Yes2. No

23. 12. • In class, we measured the angular separation between two dots on the screen. Would your measurement of the angular separation change if you moved from the front row to the back row?1. Yes2. No

24. 13. • About how far would you need to travel in a spaceship (starting on Earth) before you found that the angular separation between the Earth and sun was about 1 arcsecond? Choose the closest answer. 1. 1 light-year 2. Neptune3. 1 AU4. 3600 parsec5. Jupiter

25. 13. • About how far would you need to travel in a spaceship (starting on Earth) before you found that the angular separation between the Earth and sun was about 1 arcsecond? Choose the closest answer. 1. 1 light-year (actually, 3.26 light-years, which is a parsec) 2. Neptune3. 1 AU4. 3600 parsec5. Jupiter

26. 14. • If you traveled at one-half of the speed of light for one year, how far would you have gone?1. One-half of a light-year2. 1 parsec3. 3.26 parsecs4. To the outer edge of the solar system5. One light year

27. 14. • If you traveled at one-half of the speed of light for one year, how far would you have gone?1. One-half of a light-year2. 1 parsec3. 3.26 parsecs4. To the outer edge of the solar system5. One light year

28. 15. •  Which of the following best describes parallax?1. The plane that the sun orbits the sun in.2. A change in the apparent color of an object because of a change in position of the observer or observing point.3. A change in the apparent brightness of an object because of a change in position of the observer or observing point.4. A change in the apparent position of an object because of a change in position of the observer or observing point.

29. 16. • From January to July, the position of star A, when viewed from an observer on Earth, appeared to move a certain amount with respect to the distant stars. In class we used the diagram below to determine how the observer's view would change throughout the year.Suppose Earth's orbital distance shrunk to 0.5 AU. Would star A move more or less with respect to the distant stars throughout the year? 1. Less2. More

30. 16. • From January to July, the position of star A, when viewed from an observer on Earth, appeared to move a certain amount with respect to the distant stars. In class we used the diagram below to determine how the observer's view would change throughout the year.Suppose Earth's orbital distance shrunk to 0.5 AU. Would star A move more or less with respect to the distant stars throughout the year? 1. Less2. More

31. Related Questions • The position of an observer on Earth changes relative to the position of star A from sunrise to sunset. Would this also cause the position of star A to appear to move relative to the distant stars? If so, more or less than that caused by the change in position of an observer caused by the orbit of Earth?