# Astronomy college course/Apparent regrograde motion/Quiz01

## AstroApparentRetroMotion_Study

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### AstroApparentRetroMotion_Study-v1s1

1. ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself.

___ a) indirect; direct
___ e) direct; elliptical

2. Under what conditions would a planet not seem to rise in the east and set in the west?

___ a) if the planet is in retrograde motion
___ b) if the observer is near the north or south poles
___ c) if the observer is below the equator
___ d) if the planet is in elliptical motion
___ e) if the planet is in direct motion

3. When the faster moving Earth overtakes a slower planet outside Earth's orbit

___ a) tidal forces can be observed on the planet
___ b) all of these are true
___ c) two of these are true
___ d) tidal forces can be observed on Earth

4. Which planet spends more days in a given retrograde?

___ a) They are all equal
___ b) Mars
___ c) It depends on the season
___ d) Earth
___ e) Saturn

5. Which planet has more days between two consecutive retrogrades?

___ a) Saturn
___ b) They are all equal
___ c) Mars
___ d) Earth
___ e) It depends on the season

6. A planet that is very, very far from the Sun would be in retrograde for approximately ___ months.

___ a) 24
___ b) 6
___ c) 1
___ d) 12
___ e) 3

7. If a planet that is very, very far from the Sun begins a retrograde, how many months must pass before it begins the next retrograde?

___ a) 12
___ b) 24
___ c) 6
___ d) 3
___ e) 1

8. Planet comes from the Greek word for 'wanderer'.

___ a) true
___ b) false

9. We know that Galileo saw Neptune, but is not credited with its discovery because

___ a) he thought it was a moon of Saturn
___ b) it was in a transition between retrograde and direct motion
___ c) none of these are true
___ d) he never published his drawing
___ e) it was too faint to be worth drawing

#### Key to AstroApparentRetroMotion_Study-v1s1

1. ____ motion is in the usual direction, and _______ is motion that has temporarily reversed itself.

- a) indirect; direct
- e) direct; elliptical

2. Under what conditions would a planet not seem to rise in the east and set in the west?

- a) if the planet is in retrograde motion
+ b) if the observer is near the north or south poles
- c) if the observer is below the equator
- d) if the planet is in elliptical motion
- e) if the planet is in direct motion

3. When the faster moving Earth overtakes a slower planet outside Earth's orbit

- a) tidal forces can be observed on the planet
- b) all of these are true
- c) two of these are true
- d) tidal forces can be observed on Earth

4. Which planet spends more days in a given retrograde?

- a) They are all equal
- b) Mars
- c) It depends on the season
- d) Earth
+ e) Saturn

5. Which planet has more days between two consecutive retrogrades?

- a) Saturn
- b) They are all equal
+ c) Mars
- d) Earth
- e) It depends on the season

6. A planet that is very, very far from the Sun would be in retrograde for approximately ___ months.

- a) 24
+ b) 6
- c) 1
- d) 12
- e) 3

7. If a planet that is very, very far from the Sun begins a retrograde, how many months must pass before it begins the next retrograde?

+ a) 12
- b) 24
- c) 6
- d) 3
- e) 1

8. Planet comes from the Greek word for 'wanderer'.

+ a) true
- b) false

9. We know that Galileo saw Neptune, but is not credited with its discovery because

- a) he thought it was a moon of Saturn
+ b) it was in a transition between retrograde and direct motion
- c) none of these are true
- d) he never published his drawing
- e) it was too faint to be worth drawing