CELNAL (QUIZ2) Flashcards

1
Q

The line joining perihelion and aphelion.

A

line of apsides

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2
Q

The new moon cannot be seen because the moon:

A
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3
Q

In low latitudes, the full moon will always set at about:

A

0600 local time

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4
Q

Planets whose orbits are lesser than that of earth.

A
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5
Q

Elongation becomes zero at the:

A
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6
Q

The earth is said to be in “aphelion” on approximately.

A
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7
Q

The new moon cannot be seen because the moon:

A
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8
Q

As observed from the earth, the angle between the lines from the earth to the sun and the earth to a celestial body is known as:

A

elongation of a body

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9
Q

The celestial body is said to be in
when the sun is between this celestial body and earth.

A
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10
Q

While observing the moon, it is less than half with cusps turn away from the sun, the moon is therefore:


A
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11
Q

Phase of the moon that rises when the sun sets.

A

full moon

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12
Q

The point of nearest approach of the planet to the Sun.

A

perihelion

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13
Q

While observing the moon, it is less than half with cusps turn towards the sun, the moon is therefore:

A

waxing crescent

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14
Q

The line separating the illuminated and dark portions.

A

terminator

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15
Q

It is the period taken by the moon to go to all phases.

A
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16
Q

When the moon reaches quadrature, about a week before full moon, the moon is:

A
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17
Q

Opposition occurs when:

A

sun, moon, and earth right angles

18
Q

It is the point where the moon reaches it’s farthest distance from the earth.

A

apogee

19
Q

In low latitude, a first quarter moon will always rise at about:

A

1200 lmt

20
Q

The motion of the sun as seen by an observer on earth.

A

apparent

21
Q

When the moon reaches quadrature, about a week after full moon, the moon is:

A
22
Q

What is the “error of perpendicularity” on a marine sextant?

A

index mirror not perpendicular to the plane of the sextant

23
Q

The error remaining in the sextant after the navigator has removed side error perpendicularity error and collimation error is.

A
24
Q

The index error of a marine sextant reads as 45° 15’ 1 is known to be 3.2’ on the arc. Find the corrected sextant altitude.

A
25
Q

After all the adjustments have been made of the sextant, any remaining error is called:

A
26
Q

It is the worm gear and shaft which engages the limb.

A

tangent screw

27
Q

The movable arm of the sextant is the:

A

index arm

28
Q

It is adjacent to the micrometer drum and fixed to the arm, it allows reading to the nearest tenth of a minute of arc.

A

vernier scale

29
Q

What is the “error or collimation” on a marine sextant?

A

telescope not parallel to the frame

30
Q

The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the navigator is:

A

prismatic error

31
Q

When the index mirror and the horizon mirror of the sextant are parallel, the sextant should read:


A

0 degrees

32
Q

One complete turn of the drum of the sextant moves the index arm along the are by

A
33
Q

A sextant error, when the pivot of the index bar is not at the center of the arc.

A

centering error

34
Q

What is “side error” on a marine sextant?

A

horizon glass not perpendicular to the plane of sextant

35
Q

Which of the following is an adjustable sextant error?

A

all of these

36
Q

Which of the four adjustable errors in the sextant principal cause of index error?

A

index error not perpendicular to the frame

37
Q

The optical principle of a marine sextant is when a ray of light is reflected from a plane surface.
the angle of reflection is equal to the

A

angle of incidence

38
Q

Graduation errors occur in the following EXCEPT:

A

index mirror/vernier

39
Q

It is the sextant error when the horizon and the index mirror are not parallel..

A

index error

40
Q

The index error of a marine sextant reads as 35° 25.3’ is known to be 2’ off the arc. Find the corrected sextant altitude

A