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NAV 4 > AVS > Flashcards

AVS Flashcards

1
Q

What is your latitude if you are sailing in the northern hemisphere while the sun is in the southern hemisphere, with the sextant angle taken during meridian passage of 42°06.7’ and the declination 5°24.9’?

A

53°18.2’N

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2
Q

What is formed by arcs of a celestial meridian, an hour circle, and a vertical circle, and its vertices are the elevated pole, the zenith, and a point on the celestial sphere?

A

Navigational triangle

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3
Q

Which coordinate is a vertical circle through the east and west points of the horizon and is perpendicular to the principal vertical circle?

A

D

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4
Q

Which publication is updated annually?

A

Nautical Almanac

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5
Q

What is the plane of the sensible horizon if the observer is at the center of the Earth?

A

Celestial horizon

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6
Q

Your vessel is at sea on June 22, 2023 with DR position 32°30’ N 061°55’W . As an OOW, you are taking your position by meridian passage at 1202H with the sun’s sextant altitude of 80°55.8’ in the same hemisphere. With the following date, solve each item to determine your latitude. How much is the zenith angle?

A

8°51.4’

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7
Q

What is perpendicular to the plane of the instrument when properly adjusted?

A

B

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8
Q

What is the purpose of the part indicated by letter “E”?

A

To receive the image from the index mirror and reflect it back to the observer through the telescope

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9
Q

Which chart projects the equatorial stars of the eastern hemisphere?

A

B

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10
Q

Which is NOT TRUE about meridian passage?

A

This takes place always at precisely 12 noon.

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11
Q

Analyze which star has the azimuth of 230°

A

Altair

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12
Q

What is the sextant altitude of the body based on this reading?

A

29°42.5’

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13
Q

Which chart projects the stars with declination between 30° and 90° south?

A

B

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14
Q

Which star is used as a preference to find a position that gives 90° altitude, which is the same as your latitude when it is directly overhead if you are at the north pole?

A

Polaris

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15
Q

Which is TRUE about latitude by meridian passage position fixing method?

A

the position line that the latitude by meridian passage method will be parallel to the meridians of longitude

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16
Q

Which position is illustrated in the Figure?

A

Latitude from Polaris

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17
Q

Which point of celestial sphere is indicated by letter “B”?

A

nadir

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18
Q

Which position fixing method is illustrated in the Figure?

A

Sun-Run-Sun

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19
Q

What is the True Observed altitude of the sun?

A

81°08.6’

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20
Q

Who stated that when a body is acted upon by an external force, its acceleration if directly proportional to that force?

A

Isaac Newton

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21
Q

Which publication contains such information?

A

Nautical almanac

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22
Q

Why are Mercury & Venus considered as inferior planets?

A

The orbits of Mercury & Venus are closer to the sun than the Earth’s orbit

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23
Q

Which letter represents to Sidereal Hour Angle?

A

B

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24
Q

Which error affects the part indicated by letter “E”?

A

Index error

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25
Q

Which system of coordinates are star charts based upon?

A

Celestial equator system

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26
Q

How much is the earth’s obliquity of the ecliptic relative to its orbital plane??

A

23°26’

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27
Q

Which celestial body are you calculating if
you are using this table?

A

star

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28
Q

Calculate the intercept of the body using the following data

A

0°19.9’ Away

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29
Q

Calculate the intercept of the body using the following data:

A

0°09’ Towards

30
Q

What is the True Observed altitude of the sun?

A

80°55.6’

31
Q

What is the angular distance from A to a point on the celestial sphere and is measured along a vertical circle from 0° through 180°?

A

Azimuth

32
Q

Which chart projects the Northern stars?

A

C

33
Q

Which position is Venus plotted from?

A

AP3

34
Q

How do you acquire the index error?

A

By looking obliquely into the horizon mirror so you can see the graduated arc & its reflection, then adjust the micrometer drum where the line points at 0°

35
Q

How much is the dip correction based on the Table?

A

2.8

36
Q

What does arc GM indicate?

A

Longitude-West

37
Q

Which group of planets is commonly used in navigation?

A

Venus, Mars, Jupiter, Saturn

38
Q

Which is NOT an advantage of using longitude by meridian passage in position fixing?

A

Uses single line of position

39
Q

Which body is plotted from AP3?

A

Venus

40
Q

Which celestial body are you calculating if you are using this table?

A

Sun

41
Q

What is the advantage of this method of position fixing?

A

relies on accurate measurement of course & distance travelled to calculate the transfer

42
Q

Calculate the intercept of the body using the following data:

A

37°56.8’

43
Q

Which star or planet is plotted from AP2?

A

Capella

44
Q

What is known as the hour circle through the vernal equinox?

A

First point of Aries

45
Q

What is your latitude?

A

31°53.6’

46
Q

What is your latitude if you are sailing in the northern hemisphere, same as the sun’s, with sextant angle taken during meridian passage of 42°06.7’ and the declination is 5°24.9’?

A

42°28.4’S

47
Q

Which point is indicated by letter “E”?

A

Azimuth

48
Q

Which formula of meridian passage is used to solve for latitude if you are in the opposite hemisphere of the sun?

A

(90° – Sextant Angle) – Declination of the sun

49
Q

What is the correct term for letter ”D corresponding to other celestial coordinate system?

A

Declination

50
Q

What is the correct term for letter ”C” corresponding to other celestial coordinate system?

A

Celestial Sphere

51
Q

What is the Zn of Venus?

A

230° (Towards)

52
Q

Which point of celestial sphere is indicated by letter “A”?

A

Nadir

53
Q

Which part of the almanac gives the time for meridian passage based on the Figure?

A

D

54
Q

What is the concept of the figure?

A

Illustrates relationship between various hour angles & meridian angles

55
Q

Which publication contains all the tables required for coastal & deep sea navigation, a simple uniform method of interpolation for all the trigonometric tables, certain tables and data which are not readily available on board ship or are only used in the examination room?

A

Nautical Almanac

56
Q

What is the advantage of this method of position fixing?

A

Plotting latitude on the chart without the need to measure any bearings

57
Q

Which statement is NOT true about Keppler’s planetary law of motion?

A

The squares of the sidereal periods of any two planets are proportional to the cubes of their mean distances from the sun

58
Q

What is the hour circle of the vernal equinox if measured from the observer?

A

PsΥ

59
Q

When should this position fixing method be best taken?

A

Noon

60
Q

In the horizon system of coordinates, which coordinate is similar to the meridians of longitude?

A

C

61
Q

Which formula of meridian passage is used to solve for latitude if you are in the same hemisphere of the sun?

A

(90° – Sextant Angle) + Declination of the sun

62
Q

What is the latitude of the fix position?

A

24°43’ N

63
Q

Which is TRUE about inferior and superior planets?

A

Superior planets can pass behind the sun but cannot pass between the sun and the earth

64
Q

What is the correct term for letter ”A” corresponding to other celestial coordinate system?

A

Ascension

65
Q

Which star or planet is plotted from AP1?

A

Vega

66
Q

Which publication consists three volumes of comprehensive tables of altitude and azimuth designed for the rapid reduction of astronomical sights in the air?

A

Sight Reduction Table

67
Q

Which is NOT an advantage of the intercept method of position fixing?

A

Using a complete set of stars at a single point in time allows you to calculate a full position fix

68
Q

What do letters A & B signify in the illustration?

A

Celestial coordinates

69
Q

What does letter “C” stand for?

A

Greenwichhourangle

70
Q

Which part measures the minute of a degree?

A

D

NAV 4 (6 decks)

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