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6-49.
6-50.
6-51.
6-52.
6-53.
6-54.
6-55.
For purposes of celestial
navigation, the Earth is considered
to be which of the following
shapes?
1.
Prolate spheroid
2.
Cylinder
3.
Sphere
4.
Paraboloid
What is another name for the
celestial equator?
1.
The equinoctial equator
2.
The vernal equinox
3.
The celestial meridian
4.
The Tropic of Cancer
What is the name of a horizontal
line in the system of coordinates
used in locating objects on the
celestial sphere?
1.
Greenwich hour angle
2.
Declination
3.
Longitude
4.
Latitude
6-56.
What is the celestial reference
point used to calculate sidereal
hour angle?
1.
Sun
2.
Autumnal equinox
3.
Moon
4.
First point of Aries
IN ANSWERING QUESTIONS 6-57 THROUGH 6-60,
SELECT THE DESCRIPTION FROM COLUMN B THAT
MATCHES THE TERM IN COLUMN A. RESPONSES
ARE USED ONLY ONCE.
6-57.
6-58.
6-59.
6-60.
A. TERM
B. DESCRIPTION
Celestial
1. Measured westward
equator
from 0° through
360° from the
First point
observer's
of Aries
meridian
Hour
2. The point of
Circle
Local Hour
Angle (LHA)
reference for
measuring
declination
3. The reference
point for
measuring angles
for stars and
planets
4. Great circles that
encircle the
celestial sphere
in the same manner
as meridians
How many degrees per hour does the
hour circle of a body move?
1.
10
2.
50
3.
150
4.
240
As a celestial body moves westward,
what will happen to the value of
its GHA?
1.
Remain approximately constant
2.
Increase to 360°
3.
Decrease to 0°
4. Increase to 180° and then
decrease
What is the name of a vertical line
in the system of coordinates used
in locating objects on the
celestial sphere?
1.
Hour circles
2.
Latitude
3.
Parallel
4.
Longitude
In what direction(s) from
Greenwich, is the GHA of a body
measured?
1. West only
2.
East only
3.
East or West
4.
North
6-61.
Which of the following facts is NOT
true of the celestial coordinate
system?
1.
Celestial bodies are in
constant motion
2.
The GHA of Aries will align
Aries with the Greenwich
Meridian
3.
The LHA associates all hour
circles of any celestial body
with the Greenwich Meridian on
Earth
4. Aries is the starting point for
all celestial observations
6-62.
What is the period of time between
data that is presented in the
Nautical Almanac?
1.
Every day
2.
Every other day
3.
Every third day
4.
Every fifth day
35
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