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ASSIGNMENT 7
Textbook Assignment: "Introduction to Celestial Navigation (continued)," and "Tides and
Currents", chapters 6 and 7, pages 6-10 through 7-23.
7-1.
7-7.
7-2.
7-3.
7-4.
7-5.
7-6.
When using H.O. Pub. 249 for
figuring stars, which of the
following information must you
know?
1. GHA of Aries
2. LHA of Aries
3. Declination
4. Longitude
When star time is figured, what is
the formula for (a) evening and (b)
morning star times?
1.
(a) Subtract 30 minutes
(b) subtract 45 minutes
2.
(a) Add 45 minutes
(b) add 30 minutes
3.
(a) Add 45 minutes
(b) subtract 45 minutes
4.
(a) Add 30 minutes
(b) subtract 45 minutes
Time of sunset is 2018 GMT. What
is star time for a vessel located
at 17°23'N latitude and 74°38'E
longitude?
1.
1933
2.
1948
3.
2018
4.
2048
How should longitude be applied to
GHA to find LHA?
1.
2.
3.
4.
Add west longitude and subtract
west longitude
Always add west longitude
Always subtract east longitude
Add east longitude and subtract
west longitude
Before entering the H.O. Pub. 249,
which information must you know?
1.
LHA only
2. Declination and LHA
3.
Latitude and LHA
4.
Latitude and GHA
What information about a star may
be found in H.O. Pub 249?
7-13.
1. Hc and Ha
2. Ha and Zn
3. Ho and Hc
4. Hc and Zn
7-8.
7-9.
7-10.
7-11.
7-12.
A total of how many templates make
up the Rude Starfinder?
1. 10
2. 12
3. 14
4. 15
If a vessel is at 58° latitude,
which Rude Starfinder template
should be used?
1. 45°S
2. 50°S
3. 55°S
4. 60°S
On the Rude Starfinder template,
what is the minimum and maximum
degree intervals from the horizon?
1.
5° to 80°
2.
5° to 90°
3.
0° to 90°
4.
0° to 80°
Which of the following is not a
function of the Rude Starfinder?
1. To identify unknown stars
2. To allow the observer to choose
many stars
3. To identify planets
4.
To plot the Sun and Moon
To use the Rude Starfinder, which
information is needed?
1. LHA
2. GHA
3. Latitude
4. Declination
Which of the following terms
applies to the vertical movement of
water?
1. Currents
2. Tides
3.
Set
4. Drift
Which of the following
gravitational forces causes tides?
1. Earth and Moon only
2. Moon and Sun only
3. Earth and Sun only
4. Earth, Moon, and Sun
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