NAV4 : CELESTIAL NAV BY JEN
Celestial Navigation Quiz
Test your knowledge of celestial navigation with our comprehensive quiz! 125 carefully crafted questions will challenge your understanding of celestial bodies, angles, and the principles of navigating using the stars.
Get ready to explore:
- Angular distances and measurements
- Celestial spheres and their movements
- Important terms and definitions in navigation
Which term refers to the angular distance between the First Point of Aries and the body measured eastward?
RA
SHA
LHA
GHA
Which term refers to the angular distance of a Celestial body North or South of Equinoctial?
Zenith distance
Polar Distance
Declination
Celestial Equator
Which term refers to the angular distance of a celestial body from the nearer pole ti the body measured by the arc of the Hour cycle?
Zenith distance
Polar Distance
Declination
Celestial Equator
The extension of the Earth’s Equator on all side towards the sky is called _____.
Celestial horizon
Celestial equator
Celestial axis
Declination
The angular distance measured easterly from the first point of Aries to the body is called _____.
SHA
GHA
LHA
Right Ascension
The small circle of the celestial sphere parallel to the celestial equator and transcribed as the daily motion of the body is called _____.
Altitude circle
Diurnal circle
Vertical circle
Hour circle
Which is the celestial pole above the horizon that agrees with the name of latitude?
Zenith
Depressed pole
Nadir
Elevated pole
The daily path of the sun is along the _____.
Equator
Parallel of latitude
Hour circle
Parallel of declination
Which great circle passes through the north and south celestial poles?
Hour circle
Vertical circle
Prime vertical circle
Principal vertical circle
The distance measured westward from the observer’s meridian to the Hour circle passing through the body is called _____.
GHA
LHA
SHA
Hour angle
Which angle at the pole between the meridian of Greenwich and the hour circle of the body?
MHA
GHA
LHA
SHA
Time Diagram is a diagram on the plane of the _____.
Celestial horizon
Celestial equator
Celestial meridian
Prime meridian
Where is the body when its LHA and Meridian angle are zero?
Celestial Horizon
Pn, Ps
Meridian Passage
Celestial Equator
Which is the daily path of a celestial body that is parallel to the celestial equator?
Altitude circle
Vertical circle
Hour circle
Diurnal circle
When the declination of celestial body is zero, which statement is TRUE when the observer is on the equator?
Length of daylight is longer than darkness.
Diurnal motion is along the prime vertical.
The azimuth of celestial body is constant.
Declination is equal to altitude.
LHA’s rate of change of 1 degree every 4 minutes is mainly caused by _____.
The revolution of earth around the sun
Maximum declination of 23.5 degrees
Change of altitude of the body
The rotation of the earth on its axis
The angular distance of a celestial body north or south of the celestial equator measured along the hour circle of the body is known as _____.
Declination
Polar distance
Zenith distance
Altitude
What is the rate of change of the hour angle of the mean Sun as observed from a stationary observer?
900 minutes of arc per hour
902.46 minutes of arc per hour
2.46 minutes of arc per hour
3.46 minutes of arc per hour
Which is the celestial pole above the horizon that agrees with the name of latitude?
Zenith
Depressed pole
Nadir
Elevated pole
The arc of the horizon, or the angle at the zenith, between the north part of the celestial meridian or principal vertical circle measured from 000 degree at the north part through 360 degrees is called _____.
Zenith
Elevated pole
First Point of Aries
Greenwich meridian
A Time Diagram is a diagram on the plane of the _____.
Celestial horizon
Celestial equator
Celestial meridian
Prime meridian
What is the rate of change of the SHA of the mean sun?
2.46 minutes of arc per hour
3.46 minutes of arc per hour
900 minutes of arc per hour
902.5 minutes of arc per hour
How do you calculate the GP of a celestial body of the GMT is known?
By the body’s declination and GHA
By the body’s declination and SHA
By the body’s zenith distance and GHA
By the body’s zenith distance and SHA
The apparent circular path which celestial bodies perform daily around the earth with celestial pole as the center is called ____.
Vertical circle
Prime vertical
Diurnal circle
Hour circle
Daylight is longer than darkness when _____.
Latitude and declination have the same name
Declination is at its maximum
Altitude is equal to zero
The altitude of the observer is zero
The side PX in the navigational triangle is called _____.
Co-latitude
Co-altitude
Co-declination
Co-azimuth
The declination of a body and your latitude has the same name and are numerically equal, which of the following is CORRECT?
At upper transit, the body is in your zenith.
At lower transit, the body is in your zenith.
The body crosses the Prime Vertical below the horizon.
The body is on the horizon nadir at lower transit.
The arc of hour circle between the celestial pole, usually the elevated pole and a point on the celestial shpere is called _____.
Zenith distance
Polar distance
Longlitude
Altitude
In latitude 10° North, the sun declination is 0°, what will be the approximate azimuth at the time of rising?
080°
090°
100°
110°
When would be the polar distance of a body equal to 90°?
The latitude of the observer is 00°
The latitude of the observer is 90°
The declination of the body is 00°
The latitude of the body is 90°
The angular distance of a celestial body N or S of the celestial equator measured along the hour circle of the body is known as _____.
Declination
Polar distance
Altitude
Zenith distance
The angle at the pole between the Greenwich celestial meridian and the hour circle of the body is called _____.
GHA
LHA
SHA
Meridian Angle
The angular distance measured westerly from the first point of Aries to the hour circle passing through the body is called _____.
GHA
LHA
SHA
RA
The angular distance measured easterly from the first point of Aries to the hour circlr of the body expressed in time is called _____.
GHA
LHA
SHA
RA
Which is the arc of the celestial equator or angle at the celestial pole between upper branch of the celstial meridian and the hour circle of the body measured either east or west trough 180°?
Meridian angle
Sidereal hour angle
Local hour angle
Greenwich hour angle
The small circle of the celestial sphere parallel to the celestial equator and transcribed the daily motion of the body is the _____.
Vertical circle
Hour circle
Diurnal circle
Altitude circle
Which great circle that is always needed to from the astronomical triangle?
Celestial equator
Longitude
Celestial meridian
Prime vertical circle
Where is the body if the LHA is 180°?
Upper Transit
Lower transit
Prime vertical circle
PnPs line
Where is the body if LHA is 360°?
Upper Transit
Lower transit
Prime vertical circle
PnPs line
A great circle in the celestial sphere which has its plane perpendicular to the celestial poles is called _____.
Celestial Pole
Right Ascension
Celestial Equator
Celestial Meridian
The two opposite points of the celestial sphere where it is pierced by the earth’s axis is called ____.
Celestial Pole
Right Ascension
Celestial Equator
Celestial Meridian
The distance measured west ward from the hour circle of Aries to the hour circle of the body from 0° to 360° is called _____.
Celestial Pole
Local Hour Angle
Side Hour Angle
Celestial Meridian
A great circle of the celestial sphere, through the celestial poles and the zenith is called _____.
Celestial Pole
Right Ascension
Celestial Equator
Celestial Meridian
What is the LMT if he LHA of the sun is 180 degrees?
1200H
0900H
0600H
0000H
What is known as the part of the parallel of declination which is apparently described between the times of setting to the time of rising of heavenly bodies?
Diurnal arc
Polar distance
Nocturnal arc
Altitude circle
Which is the angular distance measured eastward from the vernal equinox of the body and expressed in time unit?
Right ascension
Meridian Angle
Sidereal Hour Angle
Local Hour Angle
What is the angle measured along the celstial equator from vernal equinox westward to the hour circle passing through the body from 0 deg to 360 deg?
Right ascension
Meridian Angle
Sidereal Hour Angle
Local Hour Angle
What is known as the angular distance of a celestial body N or S of the celstial equator measured along the hour circle of the body?
Altitude
Zenith distance
Polar distance
Declination
What is the arc of the equinoctial system of coordinates which is contained between the hour circle of Aries measured westward to the hour circle of the body?
Right Ascension
Local Hour Angle
Greenwich Hour Angle
Sidereal Hour Angle
What is the conventional representation of the sky as a spherical shell on which the celestial bodies appear projected?
Celestial Equator
Celestial Horizon
Celestial Sphere
Celestial Meridian
What is longitude of the geographical position of a body whose Greenwich hour angle is 210°30’?
30°30’ E
59°30’ W
149°30’ E
149°30’ W
_____ is an angular distance the horizon measured along the vertical to the body from 0° to 90° at the zenith.
Altitude
Parallel of altitude
Approximate altitude
Rational horizon
_____ is a circle of the celestial sphere parallel to the horizon, connecting all points of equal altitude.
Approximate altitude
Rational horizon
Altitude
Parallel of altitude
_____ is an altitude determined by inexact means either by estimation or star finder.
Rational horizon
Altitude
Parallel of altitude
Approximate altitude
_____ is a great circle on the celstial sphere formed by extending a horizontal plane parallel to the sensible horizon.
Altitude
Approximate altitude
Rational horizon
Parallel of altitude
_____ is the arc of the horizon or the angle at the zenith between the prime vertical and the vertical through the body.
Azimuth angle
Prime Vertical
Amplitude
Co-latitude
_____ is the semi-great circle which connects the Zenith and the Nadir.
Co-latitude
Azimuth angle
Prime Vertical
Amplitude
_____ is the arc of the horizon or the angle of the Zenith between the prime vertical and the vertical circle through the body.
Azimuth angle
Prime Vertical
Co-latitude
Amplitude
_____ is the side PZ in the navigational triangle.
Azimuth angle
Amplitude
Prime Vertical
Co-latitude
_____ is the difference in altitude at assumed and actual position, and also the difference in radii of circles of equal altitude at two places.
Intercept
Prime vertical
Zenith distance
True altitude
_____ is a great circle of celestial sphere whose plane is at right angle to the observer’s meridian and which passes through the zenith and nadir and through E and W points of the horizon.
Zenith distance
True altitude
Azimuth
Prime vertical
_____ is the radius of a circle of equal altitude of a body.
Azimuth
True altitude
Prime vertical
Zenith distance
_____ is the arc of the vertical circle contained between the body and the horizon.
Prime vertical
Azimuth
True altitude
Zenith distance
_____ is the direction of a line drawn from the observer’s assume position towards the geographical position of a celestial body, when plotting an LOP.
True altitude
Zenith distance
Prime vertical
Azimuth
In low latitudes, the full Moon will always rise at about _____.
Sunrise
1200 LMT
Sunset
2400 LMT
In low latitudes, the new Moon will always rise at about _____.
Sunrise
1200 LMT
Sunset
2400 LMT
In low latitudes, a first quarter Moon will always rise at about _____.
Sunrise
1200 LMT
Sunset
2400 LMT
Which planet is NOT used in celestial navigation?
Mercury
Venus
Jupiter
Saturn
The difference between local apparent time and local mean time is indicated by the _____.
Zone description
Equation of time
Longitude in time
Local apparent noon
Apparent time is based on _____.
The fictitious sun moving along the celestial equator
The movement of the First Point of Aries
The moon motion in relation to the sun
The visible sun moving along the ecliptic
When time is based on the movement of the visible sun along the ecliptic, the time is known as _____.
Mean time
Visible time
Apparent time
Real time
The whole number of hours that must be subtracted or added to zone time to obtain GMT is _____.
Zone time
Zone Description
GMT
LMT
A mean solar time measured with reference to a given local meridian is known as _____.
GMT
LMT
Zone time
Longitude in time
The measurement of the Local Mean Time is based on the passage of the sun over the _____.
Lower branch of Greenwich meridian
Upper branch of Greenwich meridian
Upper branch of observer’s meridian
Lower branch of observer’s meridian
When the time is based on the movement of the visible sun along the ecliptic, the time is known as _____.
Mean time
Visible time
Apparent time
Real time
The measurement of Local Mean Time is based on the passage of the sun over the _____.
Lower branch of Greenwich meridian
Upper branch of Greenwich meridian
Upper branch of observer’s meridian
Lower branch of observer’s meridian
The time used by astronomes and is determined by the position of the first point of Aries in the celestial shpere is called _____.
Sidereal time
Greenwich time
Local time
Apparent time
Time reckoned by the motion of the mean sun with respect to the specified geographical location is called _____.
Civil time
Mean time
Zone time
Apparent time
The angle at the celestial pole contained between the anti meridian of the observer and the meridian of the mean sun, measured westard from anti meridian of the observer and expressed units of time is called _____.
Local Apparent Time
Local Mean Time
Greenwich Apparent Time
Greenwich Mean Time
A local time of an observer on Greenwich meridian is called _____.
Local Time
Greenwich Time
Apparent Time
Universal Time
How are you going to find Local mean time if you are on east longitude ?
By adding LMT to ZD
By subtracting LMT to ZD
By adding GMT to Longitude in time
By subtracting GMT to Logitude in time
What do you call the mean solar time on Greenwich meridian?
Local Time
Apparent Time
Universal Time
Greenwich Time
How we measure solar time?
By using mean solar time
By using apparent mean sun
By using apparent solar time
By using Astronomical Mean Sun
How many hours is a solar day?
24 hours 00 minutes 00 seconds
23 hours 56 minutes 04 seconds
24 hours 50 minutes 00 seconds
23 hours 00 minutes 00 seconds
What time is reckoned with the motion of the mean sun with respect to the specified geographical location?
Civil Time
Zone Time
Mean Time
Apparent Time
When the equation of time is taken from the Nautical Almanc for use is celestial navigation, it is used to determine _____.
Sunrise
Local mean time
Time of local apparent noon
Zone time
Approxiamately how much shorter is a sideral day than a solar day?
16 min
4 min
8 min
12 min
The sidereal day begins when the _____.
1st point of Aries is over the upper branch of the reference meridian
Sun is over the lower branch of the reference meridian
Sun is over the upper branch of the reference meridian
1st point of Aries is over the lower branch of the reference meridian
What is the time measured on the celstial equator from Lower branch of the observer’s meridian westward to hour circle through the sun from 0000H to 2400H?
Zone tile
Local mean time
Sidereal time
Local apparent time
_____ is a time system used internationally and is based upon atomic time.
Coordinate Universal Time
Local Mean Time
Greenwich Time
Equation time
_____ is the angle at the celestial pole contained between the anti meridian of the observer and the meridian of the mean sun, measured westward from anti meridian of the observer and expressed units if time.
Greenwich Time
Equation time
Coordinate Universal Time
Local Mean Time
_____ is a local time of an observer on Greenwich meridian.
Equation time
Coordinate Universal Time
Local Mean Time
Greenwich Time
_____ is the difference between the local apparent time (L.A.T.) and local mean time (L.M.T.).
Local Mean Time
Equation time
Coordinate Universal Time
Greenwich Time
______ is the time used by astronomers and is determined by the position of the first point of Aries in the celestial sphere.
Equation time
Sidereal time
Mean time
Answer: 1118H
_____ is the time reckoned by motion of the mean sun with respect to the specified geographical location.
Equation time
Mean time
Answer: 1118H
Sidereal time
Which are the four navigational planets, arranged according to their or stellar magnitude?
Venus, Jupiter Saturn and Mars
Mars, Venus, Saturn and Jupiter
Venus, Jupiter, Mars and Saturn
Saturn, Mars, Jupiter and Venus
Which are the inferior planets?
Mars and Venus
Mercury, Venus and Mars
Mars and Mercury
Mercury and Venus
What is the maximum declination of sun?
23 ° 25.3
23 ° 26.3
23 ° 27.3
23 ° 28.3
The declination and SHA of the stars changes very slightly during the year. What is the reason of this slow change?
Precession of the equinoxes
Daily rotation of Earth on its axis
Revolution of the earth about the sun
Inclination of the earth’s axis to the plane of revolution
The point on the ecliptic system occupied by the sun at maximum declination south is called the _____.
Vernal equinox
Winter solstice
Summer solstice
Autumnal equinox
Polaris is part of what constellation?
Orion
Ursa Minor
Ursa Major
Cassiopeia
Which constellation contains the pointer stars to locate the star Polaris?
Cassiopeia
Orion
Ursa minor
Ursa major
Which is/are true regarding Polaris as a circumpolar body? I. It does NOT set II. It can be seen anywhere on earth
I only
II only
Either I or II
Neither I nor II
What is the reason why Polaris is NOT a permanent north star?
Tilt of the earth’s axis
Precession of the equinoxes
Constantly changing declination of the sun
Obliquity of the earth’s revolution around the sun
What information’s are needed to extract the three correction factors in the Polaris tables?
GHA Aries, latitude and month
GHA Aries, latitude and longitude
LHA Aries, latitude and month
LHA Aries, latitude and longitude
A celestial body with an azimuth of 270°will give LOP that determines your _____.
Longitude
Latitude
Polar distance
Zenith distance
In the lower right hand column of the daily pages of the Almanac, the time of Meridian Passage is given in _____.
GMT
LMT
LAN
LZT
Symbol ’////’ is shown in place of time to indicate _____.
Twilight troughout the night
Twilight all day
Constant daylight
Constant night
The unshaded rectangle in the Nautical Almanac means _____.
Constant daylight
Constant night
Twilight all day
Twilight all night
In the lower right hand column of the daily pages of Almanac, the time of Meridian Passage is given in _____.
GMT
LMT
LAN
LZT
Symbol ’///’ is shown in place of time to indicate _____.
Constant daylight
Constant night
Twilight all day
Twilight all night
Which of the following is true in getting sunrise / sunset using nautical almanac?
Using given latitude, interpolation, ZD
Using given latitude, Longitude in time, ZD
Using higher and lower latitude, Longitude in time, ZD
Using higher and lower latitude, Interpolation, Longitude in time
How many days does Moonrise and moonset have in a page of nautical almanac?
3
4
5
6
How can you find LHA of star using nautical almanac?
Getting GHA and Inc of Star + Longitude
Getting GHA and Inc of Star + Longitude
Getting GHA and Inc of Aries + SHA of Star +East Longitude
Getting GHA and Inc of Aries + SHA of Star + West Longitude
_____ is a navigator should measure first of the height of the eye and use the table of corrections or formula.
Dip
Index error
Refraction
Parallax
What is the correction applied to the visible horizon to obtain sensible horizon?
Dip
Index error
Refraction
Parallax
How many navigational stars are listed in the nautical almanac?
51
53
55
57
Time of sunrise and sunset in the nautical almanac is in _____.
GMT
UTC
LMT
LZT
Which is used to find the GHA and declination of the sun at the time of observation in the nautical almanac?
GMT
UTC
LMT
LZT
The time of the sun’s meridian passage listed in the nautical almanac is in ______.
GMT
UTC
LMT
LZT
Which is used as the entering argument in the nautical almanac’s altitude correction table?
Sextant altitude
Apparent altitude
Observed altitude
Corrected altitude
The angular distance between prime vertical and the vertical circle of the body during sunrise and sunset is called _____.
Azimuth angle
Azimuth
Amplitude
Bearing
The sun will rise at 0600H and set at 1800H when the observer is at what latitude?
Latitude 0 degree
Lattude 10 degrees
Latitude 45 degrees
Latitude 60 degrees
When the observer is at the equator, the sun’s declination in 12°N. What is the azimuth of the sun at rising?
078°
088°
090°
100°
In latitude 28°S, the sun’s declination is 0°, what will be the approximate azimuth on rising?
062°
076°
090°
118°
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