CELNAL (QUIZ2)

Question 1

The line joining perihelion and aphelion.

Answer 1

line of apsides

Question 2

The new moon cannot be seen because the moon:

Question 3

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

Answer 3

0600 local time

Question 4

Planets whose orbits are lesser than that of earth.

Question 5

Elongation becomes zero at the:

Question 6

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

Question 7

The new moon cannot be seen because the moon:

Question 8

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:

Answer 8

elongation of a body

Question 9

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

Question 10

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


Question 11

Phase of the moon that rises when the sun sets.

Answer 11

full moon

Question 12

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

Answer 12

perihelion

Question 13

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

Answer 13

waxing crescent

Question 14

The line separating the illuminated and dark portions.

Answer 14

terminator

Question 15

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

Question 16

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

Question 17

Opposition occurs when:

Answer 17

sun, moon, and earth right angles

Question 18

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

Answer 18

apogee

Question 19

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

Answer 19

1200 lmt

Question 20

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

Answer 20

apparent

Question 21

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

Question 22

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

Answer 22

index mirror not perpendicular to the plane of the sextant

Question 23

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

Question 24

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.

Question 25

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

Question 26

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

Answer 26

tangent screw

Question 27

The movable arm of the sextant is the:

Answer 27

index arm

Question 28

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

Answer 28

vernier scale

Question 29

What is the "error or collimation" on a marine sextant?

Answer 29

telescope not parallel to the frame

Question 30

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:

Answer 30

prismatic error

Question 31

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


Answer 31

0 degrees

Question 32

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

Question 33

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

Answer 33

centering error

Question 34

What is "side error" on a marine sextant?

Answer 34

horizon glass not perpendicular to the plane of sextant

Question 35

Which of the following is an adjustable sextant error?

Answer 35

all of these

Question 36

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

Answer 36

index error not perpendicular to the frame

Question 37

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

Answer 37

angle of incidence

Question 38

Graduation errors occur in the following EXCEPT:

Answer 38

index mirror/vernier

Question 39

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

Answer 39

index error

Question 40

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