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3-40.
What type of fix is obtained by one
LOP of a heavenly body?
1. AP
2.
EP
3. DR
4.
C e l e s t i a l
3-41.
H o w i s t h e s t a r ' s a l t i t u d e f r o m t h e
3-42.
3-43.
3-44.
3-45.
assumed position referred?
1.
Ha
2.
Ho
3.
Hc
4.
Hz
Which of the following is the
s e x t a n t a l t i t u d e o f a s t a r ?
1.
Ha
2.
Ho
3.
Hc
4.
Hs
What is obtained when sextant
a l t i t u d e i s c o r r e c t e d ?
1. Ho
2.
Ha
3.
Hc
4.
Hs
When plotting a star's LOP, the
abbreviation HoMoTo means the
a l t i t u d e i n t e r c e p t s h o u l d b e
measured from the EP toward
t h e s t a r .
1.
True
2.
F a l s e
When you are observing the Sun,
w h a t i s t h e n e x t s t e p t o c a r r y o u t
a f t e r y o u h a v e t r a i n e d t h e l i n e o f
s i g h t o n t h e p o i n t o f t h e h o r i z o n
just below the Sun?
1.
R a i s e t h e s e x t a n t u n t i l t h e
l i n e o f s i g h t t o u c h e s t h e l o w e r
limb of the Sun
2.
Swing the arc about the line of
s i g h t
3.
Move the index arm until the
Sun appears in the mirror
4.
Move the micrometer drum to
b r i n g t h e d i r e c t a n d t h e
r e f l e c t e d h o r i z o n s i n l i n e
IN ANSWERING QUESTIONS 3-46 THROUGH 3-49,
SELECT FROM COLUMN B THE DESCRIPTION THAT
MATCHES THE CORRECTION IN COLUMN A.
RESPONSES WILL ONLY BE USED ONCE.
A. CORRECTION B. DESCRIPTION
3-46. R e f r a c t i o n
1. Difference between
3-47. Dip
3-48. P a r a l l a x
2
3-49. Semidiameter
3
4.
t h e c e l e s t i a l a n d
v i s i b l e h o r i z o n s
D e v i a t i o n o f r a y s
o f l i g h t f r o m a
s t r a i g h t l i n e
Earth's atmosphere
Proximity of
b o d i e s o f t h e
s o l a r s y s t e m t o
t h e E a r t h ,
r e s u l t i n g i n a
d i f f e r e n c e i n
a l t i t u d e s m e a s u r e d
from the surface
a n d t h e c e n t e r o f
t h e E a r t h
Results from the
nearness of bodies
o f t h e s o l a r
system.
Makes it
n e c e s s a r y t o
c o n s i d e r t h e
observed bodies as
a p p r e c i a b l e s i z e
i n s t e a d o f p o i n t s
o f l i g h t
3-50.
When does maximum refraction occur?
1.
When a body is on the horizon
amounting to between 24 and 29
minutes of arc
2.
When a body is on the horizon
amounting to between 34 and 39
minutes of arc
3.
When a body is on the horizon
amounting to between 18 and 27
minutes of arc
4.
When a body is on the horizon
amounting to between 35 and 45
minutes of arc
3-51.
Refraction varies with atmospheric
c o n d i t i o n s .
At what point should
observations be regarded as
suspicious?
1.
Below 5o
2.
Below 10o
3.
Above 15°
4.
At 0°
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