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ASSIGNMENT 11
Textbook Assignment: "Celestial Observations and Sight Reduction Methods (continued)," and
"Weather Observation," chapters 9 and 10, pages 9-32 through 10-13.
11-1.
The H.O. 249 method of sight
reduction is less accurate than
the H.O. 229 method.
11-2.
11-3.
1.
True
2.
False
H.O. 249 is also known as which of
the following manuals?
1.
2.
3.
4.
Navigation Almanac
Air Almanac
Sight reduction tables for Air
Navigation
Nautical Almanac
Which of the following is a high
magnitude star?
1.
ALTAIR
2.
NUNKI
3.
VEGA
4.
KOCHAB
IN ANSWERING QUESTIONS 11-4 AND 11-5,
REFER TO FIGURE 9-18 IN YOUR TEXT.
11-4.
What is/are the disadvantage(s) of
using the H.O. 249 method of sight
reduction?
1.
H.O. 249 lists specific stars
to use
2.
H.O. 249 is only useful in
lower latitudes
3.
H.O. 249 is only useful in
higher latitudes
4.
All of the above
11-5.
When entering H.O. 249 to obtain
the preferred stars, what
information must be known?
1.
Latitude and GHA
2.
Latitude and LHA only
3.
Latitude and SHA
4.
Latitude, LHA, and the star's
name
11-6.
What is the result of two morning
sunlines and an LOP of LAN?
1.
A noon celestial running fix
2.
A noon celestial EP
3.
A noon celestial AP
4.
A running fix
IN ANSWERING QUESTIONS 11-7 THROUGH 11-11
REFER TO FIGURES 11-A AND 11-B (EXCERPTS
FROM THE NAUTICAL ALMANAC). FIGURES 11-A
AND 11-B ARE LOCATED AT THE END OF THIS
ASSIGNMENT. YOUR SHIP IS UNDERWAY IN THE
ATLANTIC AND YOU SHOOT LAN. THE FOLLOWING
INFORMATION IS GIVEN:
DATE:
1 AUGUST 1984
DR LATITUDE:
32°20.1N
DR LONGITUDE:
17°50.0W
ZT LAN OBSERVED:
1218
IC:
1.5
hs:
75°20.1'
HEIGHT OF EYE:
60 FT
11-7.
What is the standard meridian?
11-8.
11-9.
11-10.
11-11.
11-12.
1.
0°
2.
7 1/2°
3.
15°
4.
22 1/2°
What is the d longitude (arc)?
1.
1° 50'
2.
1° 45'
3.
2° 15'
4.
2° 50'
What is the d longitude (time)?
1.
8 min
2.
10 min
3.
11 min
4.
14 min
What is the local mean time of
meridian passage?
1.
1206
2.
1218
3.
1230
4.
1300
What is the ZT LAN (1st est)?
1.
1206
2.
1216
3.
1217
4.
1218
What is the oldest method of
determining meridian altitude of
the Sun?
1.
Maximum altitude
2.
Numerous sights
3.
Maximum sights
4.
Maximum azimuth
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