1. What Is the Average Distance from the Earth to the Sun?

Astro Ch 3 & 4.3 Test Review

1. What is the average distance from the Earth to the Sun?

2. Exactly how many days does it take for the Moon to go through it a Synodic Month?

3. A ______month of the Moon cycle is a true 360o revolution?

4. ______is the closest elliptical point of any object orbiting a larger object.

5. ______is the farthest elliptical point of the Moon in its orbital path around the Earth.

6. How many arc minutes per hour does the Moon travel in its orbital path?

7. What is the stage of the Moon from Full Moon to New Moon called?

8. What is it called when more of the Moon is illuminated by the Sun than in shadow?

9. About how many days past New Moon phase is the 3rd Quarter phase?

10. What time of day does the 1st Quarter Moon set?

11. If the Moon is full, and it is sunset, where will the Moon be in the sky?

12. In which area in Figure 1 is the object moving fastest in its orbital path?

13. In which area in Figure 1 is the object moving slowest in its orbital path?

14. Which planet of our Solar System has an orbital path closest to a perfect circle?

15. Who was the man responsible for collecting the data

used to discover the 3 Laws of Planetary Motion?

16. What is the distance of Jupiter’s aphelion in kilometers?

17. What is the semi-major axis of a planet, if its orbital period is 12 years?

18. If the eccentricity of a planet’s orbital path is 0.15 and its major axis is

measured at 600,000,000 km, what is its perihelion?

19. If the eccentricity of a planet’s orbital path is 0.15 and its major axis is

measured at 600,000,000 km, what is its aphelion?

20. What is the orbital period of the ellipse in Figure 2?

(Use the numbers from questions 1819 to answer this question)

21. How fast is the planet mentioned in questions 1819 traveling at

its perihelion if its minimal orbital velocity is 2.75 km/sec?

22. What is the eccentricity of a planet orbiting a nearby star system if the distance

between the foci is 1.5 AUs and its semi-major axis measures 2.5 AUs?

23. Which statement about eccentricity is true? 0 > e > 1 0 = e = 1 0 < e < 1

24. Which of Kepler’s Law of Motion does Figure 1 display?

25. What is it called when the Moon is at its apogee and the Earth is at its perihelion, and

the angular diameter of the Moon is smaller than the angular diameter of the Sun?

26. What is it called when the Moon and the Sun have the same angular diameter,

and the Moon is blocking the photosphere of the Sun?

27. What is it called when only part the Moon is in the Earth shadow or

when only some of the Sun is being blocked by the Moon?

28. What is the central part of an eclipse where the Sun is completely

blocked, casting a full shadow, called?

29. What is the part of an eclipse where the Sun ispartially

blocked, casting a partial shadow, called?

30. What is the plane of the Earth’s orbit around the Sun called?

31. What is the conical motion of the Earth’s axis called?

32. What is the movement of objects across the sky due to the Earth’s rotation on its axis called?

33. What is the points where the Moon passes through the plane of the Earth’s orbit called?

34. What is it called when Astronomers can calculate distances

by measuring the baseline and angles?

35. What is the apparent motion of an object as seen against a

distant background from two observation points called?

36. What is the full length of the long axis of an ellipse called?

37. What is the measurement of the flatness of an ellipse called?

Equations:

P2=a3

a(1+e)

a(1-e)

DP x VP = DA x VA

e =distance between foci

major axis