Celestial Navigation Quiz
Celestial Navigation Quiz
Test your knowledge of celestial navigation with this comprehensive quiz! Whether you're a beginner or an experienced navigator, this quiz offers a variety of questions about the positions and movements of celestial bodies.
Get ready to explore topics such as:
- The ecliptic and celestial coordinates
- Solar altitudes and declinations
- The use of navigational instruments
- Time systems in astronomy
The apparent path of the sun around the solar system is called _____.
Ecliptic
Equinox
Equator
Path
Which term refers to the point on the ecliptic at which the sun reaches its farthest position north of the celestial equator?
Vernal equinox
Autumnal equinox
Summer solstice
Winter solstice
LHA’s rate of change of 1 degree every 4 minutes is mainly caused by _____.
The revolution of the earth around the sun
The rotation of the earth on its axis
Maximum declination of 23.5 degrees
Change of altitude of the body
How do you calculate the Geographical Position of a celestial body if the GMT is known?
By the body’s zenith distance and SHA
By the body’s declination and GHA
By the body’s zenith distance and GHA
By the body’s declination and SHA
Daylight is longer than darkness when _____.
Declination is at its maximum
Latitude and declination have the same name
The altitude of the observer is zero
Altitude is equal to zero
Where is the body if the LHA is 180°?
Upper Transit
Prime vertical circle
Lower transit
PnPs line
Where is the body if LHA is 360°?
Upper Transit
Prime vertical circle
Lower transit
PnPs line
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
What is known as the angular distance of a celestial body N or S of the celestial equator measured along the hour circle of the body?
Altitude
Polar distance
Zenith distance
Declination
What is the arc of the equinoctial system of coordinates that 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
The sun’s true altitude at meridian passage was 61° 25’S, the sun declination is 16° 23’N. What is the latitude of the observer?
44° 58’N
44° 58’S
28° 35’N
28° 35’S
The navigator observed the planet, Venus, at 90° altitude, declination is 22° 37.6’ N, and the GHA is 208° 14.3’. Compute the longitude of the observer.
151° 45.7 E
151° 54.7 E
151° 46.0 E
151° 46.0 W
The navigator observed the planet, Venus, at 90° altitude, declination is 22° 37.6’ N and the GHA is 208° 14.3’. Compute the latitude of the observer.
22° 37.8’N
22° 37.6’N
67° 22.4’N
67° 22.8’N
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
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
The whole number of hours that must be subtracted or added to zone time to obtain GMT is _____.
Zone time
Zone Description
GMT
LMT
When the time is based on the movement of the visible sun along the ecliptic, the time is known as _____.
Mean time
Apparent time
Visible time
Real-time
The time used by astronomers and is determined by the position of the first point of Aries in the celestial sphere is called _____.
Sidereal time
Greenwich time
Apparent time
Local time
The time of sunrise and sunset in the nautical almanac is expressed in _____.
GMT
LMT
UTC
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
LMT
UTC
LZT
Which is used as the entering argument in the nautical almanac’s altitude correction table?
Sextant altitude
Observed altitude
Apparent altitude
Corrected altitude
The angular distance between the prime vertical and the vertical circle of the body during sunrise and sunset is called _____.
Azimuth angle
Amplitude
Azimuth
Bearing
The sun will rise at 0600H and set at 1800H when the observer is at what latitude?
Latitude 0-degree
Latitude 45 degrees
Latitude 10 degrees
Latitude 60 degrees
What is the correction applied to the visible horizon to obtain a sensible horizon?
Dip
Refraction
Index error
Parallax
In a sextant, the lower part of the frame that carries the arc graduated in degrees is called _____.
Teeth
Limb
Frame
Arc
Which part of the sextant is pivoted at the center of the curvature of the arc with its lower end carrying an index mark to indicate the reading in degrees on the arc?
Index arm
Tangent screw
Micrometer drum
Limb
What error occurs when the horizon glass is not perpendicular to the plane of the sextant?
Error of Perpendicularity
Side Error
Prismatic Error
Index Error
Which part of the sextant is used to adjust the index arm and is mounted on a shaft having a pinion gear at the other end called the tangent screw?
Limb
Index arm
Telescope
Micrometer drum
Which part of the sextant is mounted at the upper end of the index arm directly over its pivot point and is perpendicular to the plane of the instrument?
Horizon glass
Index mirror
Shade glasses
Tangent screw
What is a double reflecting instrument for measuring angles, primarily altitudes of celestial bodies?
Sextant
Shadow Pin
Pelorus
Azimuth Circle
Mounted at the end of the index arm where it engages the teeth of the limb is called _____.
Drum screw
Horizon glass
Index arm
Tangent screw
What information is needed to extract the three correction factors in the Polaris tables?
GHA Aries, latitude, and month
LHA Aries, latitude, and month
GHA Aries, latitude, and longitude
LHA Aries, latitude, and longitude
How many days do Moonrise and moonset have on a page of the nautical almanac?
3
5
4
6
In latitude 28°S, the sun’s declination is 0°, what will be the approximate azimuth on rising?
90°
120°
062°
076°
How many navigational stars are listed in the nautical almanac?
57
59
58
60
When the observer is at the equator, the sun’s declination in 12°N. What is the azimuth of the sun at rising?
090°
088°
078°
100°
What is the amplitude of the sun, if the vessel’s position is 14°27’N, 120° 33’E, the sun’s declination is 05° 00.8°, bearing of the sun is 092°?
W 5.2° N
E 5.2° N
E 11.1° N
W 11.1° N
In low latitudes, the full Moon will always rise at about____.
Sunrise
Sunset
1200 LMT
2400 LMT
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