CELNAV (QUIZ)

Question 1

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

Question 2

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

Question 3

The new moon cannot be seen because the moon:

Question 4

The celestial body is said to be in

Question 5

When the index and horizon mirrors of a properly adjusted sextant are at angle of 450 to each other, the arc reads

Question 6

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

Question 7

Opposition occurs when:

Question 8

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

Question 9

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:

Question 10

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

Question 11

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

Question 12

The line joining perihelion and aphelion.

Question 13

Planets whose orbits are lesser than that of earth.

Question 14

Phase of the moon that rises when the sun sets.

Question 15

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

Question 16

The new moon cannot be seen because the moon:

Question 17

Elongation becomes zero at the:

Question 18

The point of nearest approach of the planet to the Sun

Question 19

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

Question 20

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

Question 21

The line separating the illuminated and dark portions.

Question 22

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

Question 23

What is “side error” on a marine sextant?

Question 24

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

Question 25

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

Question 26

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


Question 27

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.

Question 28

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:

Question 29

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

Question 30

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

Question 31

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

Question 32

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

Question 33

Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60° reading is

Question 34

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

Question 35

The movable arm of the sextant is the:

Question 36

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

Question 37

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

Question 38

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

Question 39

Graduation errors occur in the following EXCEPT: