Sunday, March 15, 2009

Nautical Astronomy Questions

These are Coast Guard exam question that you may find on the Navigation General exam.

1. The spinning motion of a body around its axis is called?
A. revolution
B. rotation
C. orbit
D. space motion

2. The precession of the equinoxes occurs in a?
A. easterly direction
B. westerly direction
C. northerly direction
D. southerly direction

3. The ecliptic is?
A. the path the sun appears to take among the stars
B. the path the earth appears to take among the stars
C. a diagram of the zodiac
D. a great circle on a nomadic chart

4. Which condition exist during summer solstice in the northern hemisphere?
A. The north polar regions are in continual darkness
B. The northern hemisphere is having short days and long nights
C. The southern hemisphere is having winter
D. The sun shines equally on both hemispheres

5. A first magnitude star is?
A. 2.5 times as bright as a second magnitude star
B 3 times as bright as a second magnitude star
C. 5 times as bright as a second magnitude star
D. 10 times as bright as a second magnitude star

6. What is the length of the lunar day?
A. 24h 50m 00s
B. 24h 00m 00s
C. 23h 56m 04s
D. 23h 03m 56s

7. After Venus passes the point of greatest elongation east in its orbit, the first position at which elongation will be zero is?
A. superior conjunction
B. inferior conjunction
C. opposition
D. none of the above

8. The planet Mars will have its greatest magnitude when at?
A. conjunction
B. opposition
C. east quadrature
D. west quadrature

9. Inferior conjunction is possible for?
A. Mars
B. Venus
C. Saturn
D. Jupiter

10. In low latitudes first quarter moon will always rise at about?
A. sunrise
B. 1200 local time
C. sunset
D. 2400 local mean time

11. The sun is closest to the earth in what month?
A. October
B. July
C. April
D. January

12. The dimmest stars that could reasonably be used for navigational purposes are of what madnitude?
A. First
B. Third
C. Sixth
D. Tenth

13. Aphelion is the point where the sun?
A. moon , and earth form a right angle
B. moon, and earth are in line
C. crosses the celestial equator
D. is farthest from the earth

14. When a superior planet is at 90 degrees elongation, it is also at?
A. conjunction
B. opposition
C. quadrature
D. transit

15. The moon is nearest the earth at?
A. perigee
B. the vernal equinox
C. the new moon
D. the full moon