CELNAL (QUIZ2) Flashcards
The line joining perihelion and aphelion.
line of apsides
The new moon cannot be seen because the moon:
In low latitudes, the full moon will always set at about:
0600 local time
Planets whose orbits are lesser than that of earth.
Elongation becomes zero at the:
The earth is said to be in “aphelion” on approximately.
The new moon cannot be seen because the moon:
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:
elongation of a body
The celestial body is said to be in
when the sun is between this celestial body and earth.
While observing the moon, it is less than half with cusps turn away from the sun, the moon is therefore:
Phase of the moon that rises when the sun sets.
full moon
The point of nearest approach of the planet to the Sun.
perihelion
While observing the moon, it is less than half with cusps turn towards the sun, the moon is therefore:
waxing crescent
The line separating the illuminated and dark portions.
terminator
It is the period taken by the moon to go to all phases.
When the moon reaches quadrature, about a week before full moon, the moon is:
Opposition occurs when:
sun, moon, and earth right angles
It is the point where the moon reaches it’s farthest distance from the earth.
apogee
In low latitude, a first quarter moon will always rise at about:
1200 lmt
The motion of the sun as seen by an observer on earth.
apparent
When the moon reaches quadrature, about a week after full moon, the moon is:
What is the “error of perpendicularity” on a marine sextant?
index mirror not perpendicular to the plane of the sextant
The error remaining in the sextant after the navigator has removed side error perpendicularity error and collimation error is.
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.
After all the adjustments have been made of the sextant, any remaining error is called:
It is the worm gear and shaft which engages the limb.
tangent screw
The movable arm of the sextant is the:
index arm
It is adjacent to the micrometer drum and fixed to the arm, it allows reading to the nearest tenth of a minute of arc.
vernier scale
What is the “error or collimation” on a marine sextant?
telescope not parallel to the frame
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:
prismatic error
When the index mirror and the horizon mirror of the sextant are parallel, the sextant should read:
0 degrees
One complete turn of the drum of the sextant moves the index arm along the are by
A sextant error, when the pivot of the index bar is not at the center of the arc.
centering error
What is “side error” on a marine sextant?
horizon glass not perpendicular to the plane of sextant
Which of the following is an adjustable sextant error?
all of these
Which of the four adjustable errors in the sextant principal cause of index error?
index error not perpendicular to the frame
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
angle of incidence
Graduation errors occur in the following EXCEPT:
index mirror/vernier
It is the sextant error when the horizon and the index mirror are not parallel..
index error
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
