Welcome to the website where you can pass online the Seafarer Evaluation Training System (SETS) test on «Celestrian Navigation». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. SETS based on practical information and marine specialists experience.
SETS tests developed for evaluating seaman basic knowledge by company “Naval Education Services” is an evaluating online-tool, used for revealing any professional preparation needed in specific fields of knowledge, defined by STCW Section A-V/1-2.
SETS tests have proven themselves as good tools for the selection and recruitment process, as well as advancing the level of knowledge of the current officers and crew.
Current test contains SETS questions in area «Celestrian Navigation». Those questions can be used for competence verification specialist capable of preventing accidental situations related with transporting safety, or also for self-examination.
«Celestrian Navigation» subject includes theoretical and practical information about advanced training for work on any type of vessel. This test evaluates theoretical knowledge of celestial navigation principles, including star identification, sextant use and nautical astronomy calculations. Practical components assess the ability to determine a vessel’s position using sun, moon and star sightings under simulated open-ocean conditions. Candidates must demonstrate proficiency in correcting celestial observations for atmospheric refraction, parallax and instrument error. This test includes emergency scenarios where electronic systems fail, requiring manual celestial fixes as backup navigation. Advanced waypoint routing using celestial charts and dead reckoning under varying weather conditions is tested. A timed section evaluates the speed and accuracy of reducing celestial data to plot positions on Mercator and gnomonic projections. Test-takers analyze historical voyage logs to identify celestial navigation errors and propose corrections. Successful completion certifies competency in celestial navigation for all vessel types, from merchant ships to offshore sailing yachts.
On this site SETS on the subject «Celestrian Navigation» contains 71 questions you need to answer with no possibility to go back to previous question. Therefore, we recommend carefully reading each question and making decision with no hurry. In case you have some difficulty answering, you have also possibility to request a hint.
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* Some questions may have more than 1 correct answer.
For a polar star, which, from those listed, is NOT true?
Dec = 89,1° N, azimuth = 358°-2°.
Dec = 45° S, azimuth = 180°.
Dec = 0°, azimuth = 90°.
Dec = 30° N, azimuth = 270°.
The Sun is on the observer’s meridian, declination is 9° 15′.0 S, Zenith distance is 46°23.9′, bearing to north. Calculate the observer’s latitude.
45°30′.0 N.
60°00′.0 S.
50°45′.5 N.
55°15′.9 S.
The true altitude of Arcturus is 42° 28′.4. Find the true zenith distance.
42° 28′.4.
50°15′.0.
47°31′.6.
38°45′.2.
Angle between the planes of the index mirror and horizon mirror of the sextant is 20°. What is the reading on the arc?
30°.
40°.
50°.
60°.
The sidereal hour angle of a celestial body is the …
Angle between point of Aries meridian and celestial body meridian.
Angle between the celestial body and the zenith.
Angle between the celestial body and the horizon.
Angle between the celestial body and the equator.
The earth rotates on its axis with a period of about ….
12 h.
24 h.
36 h.
48 h.
The first point of Aries is the point on the celestial sphere where …
21.03.
21.06.
21.09.
21.12.
The path of the earth’s rotation around the sun, relative to the plane of the equator, is …
Circular 30°.
Elliptical 45°.
Eliptica 23.5°.
Parabolic 15°.
The times of sunrise and sunset are tabulated in the Nautical Almanac. These times are …
Universal Time.
Local Time.
Greenwich Mean Time.
Standard Time.
The Sun is on the observer’s meridian, declination is 22° N, zenith distance is 15°, and bearing to South. Calculate the observer’s latitude.
40° N.
37° N.
35° N.
30° N.
A first observation of the Sun was taken at 0915 Local Time. If the vessel is steaming at 16 knots, how far should the position line be moved along the course made good to find the position at 1 200?
50 miles.
44 miles.
40 miles.
36 miles.
To an observer at the south pole, at the beginning of September …
Polar night 21.03-23.09.
Polar day 23.09-21.03.
Continuous daylight 01.09-30.09.
Polar twilight 21.09-23.09.
To an observer in longitude 172° E, the Local Hour Angle (LHA) of a star is 315°. If the Sidereal Hour Angle (SHA) of the star is 036°, what is the GHA of Aries?
120°.
107°.
90°.
85°.
Given that the true altitude is 61° 47.9′ calculate the True Zenith Distance.
30° 15.5′.
28° 12.1′.
25° 30.0′.
32° 45.3′.
If the Azimuth of a body is found to be 069° True, the Position Line would be drawn through the Intercept Terminal Position in a direction of …
Position Line perpendicularly to azimuth 159°/339°.
Position Line perpendicularly to azimuth 090°/270°.
Position Line perpendicularly to azimuth 045°/225°.
Position Line perpendicularly to azimuth 120°/300°.
What is the «error of perpendicularity» on a marine sextant?
That error in the reading of a marine sextant due to nonperpendicularity of the index mirror to the frame.
That error caused by the curvature of the Earth.
That error due to the refraction of light.
That error in the reading due to the observer’s altitude.
If the Azimuth of a body is found to be 222° True, the position line would be drawn through the Intercept Terminal Position in a direction of …
180°/360°.
312°/132°.
270°/090°.
045°/225°.
The Sun when on the observer’s meridian, declination is 16° 25′.4 N, Zenith distance is 6° 57.4′, bearing to North Calculate the observer’s latitude.
12° 15′ N.
9° 28′ N.
10° 45′ N.
8° 30′ N.
The declination of a celestial body is the …
angle between the celestial equator and the ecliptic.
meridian arc from equator to parallel.
distance from the celestial equator to the celestial pole.
angle between the horizon and the celestial body.
The true altitude of the sun’s lower limb is 74° 45′.4. Find the lower limb’s true zenith distance.
20° 30′.2.
15° 14′.6.
10° 45′.5.
12° 25′.3.
Given that the true altitude is 57° 24.9′, calculate the True Zenith Distance.
32° 35.1′.
28° 45.2′.
30° 15.5′.
34° 50.3′.
To an observer in longitude 164° E, the LHA of the sun is 26°. What is the GHA of the sun?
190°.
222°.
180°.
200°.
The moon rotates around the earth approximately every …
month.
week.
year.
day.
The sun is at the first point of Aries on the celestial sphere at approximately …
21.06.
21.03.
21.12.
21.09.
The magnitude of a star is a measure of its …
distance from Earth.
less brightness.
brightness and luminous stars.
color.
If the Azimuth of a body is found to be 355° True, the Position Line would be drawn through the Intercept Terminal Position in a direction of …
85°/265°.
90°/270°.
180°/360°.
45°/225°.
If the Greenwich Hour Angle (GHA) of the sun is 173° and the Local Hour Angle (LHA) is 358°, what is the longitude?
180° E.
175° W.
165° E.
170° W.
The Sun is on the observer’s meridian, declination is 16° 25′.4 N, zenith distance is 31°30′, bearing to South. Calculate the observer’s latitude.
48°10′.2 N.
47°20′.5 N.
46°30′.1 N.
47°55′.4 N.
At the winter solstice, the sun will not rise at all (Polar Night) in the latitudes higher than …
67.5° N.
66.5° N.
65.0° N.
68.0° N.
The Sun when on the observer’s meridian, declination is 17° 22′.1 N, Zenith distance is 39° 14.3′, bearing to North. Calculate the observer’s latitude.
22°10′.5 S.
21°52′.2 S.
20°45′.3 S.
23°30′.1 S.
The moon rotates around its axis with a period of …
28,0 days.
Star month 27,3 days, moon month 29,5 days.
30,0 days.
26,5 days.
The Sun is on the observer’s meridian, declination is 21° S, zenith distance is 6°, bearing to North. Calculate the observer’s latitude.
28° S.
27° S.
26° S.
29° S.
The summer solstice in the southern hemisphere is approximately on …
21.12.
22.12.
23.12.
20.12.
From those listed, how can the index error be detected in a marine sextant?
by Star.
by Horizont.
by Sun.
«Off arc +, Onn arc –».
Which one of the following errors of the sextant would you attempt to remove?
horizon error.
parallax error.
index error.
refraction error.
A position line drawn in the direction 070°/250° could correspond to an azimuth of the observed body of …
150°/330°.
160°/340°.
170°/350°.
140°/320°.
A position line drawn in the direction 095°/275° could correspond to an azimuth of the observed body of …
190°/010°.
185°/005°.
180°/000°.
175°/355°.
Given that the true altitude is 46° 20.2′, calculate the True Zenith Distance.
42° 30.5′.
43° 39.8′.
44° 15.2′.
41° 50.1′.
What is the angle between the ecliptic and the equinoctial?
22.5°.
23.5°.
24.0°.
21.0°.
If a ship is in 150° E longitude and the equation of time is +6 minutes, what is the GMT of noon at the ship?
0,1 h 0,4 m.
0,2 h 0,6 m.
0,3 h 0,5 m.
0,0 h 0,8 m.
Given that the True Zenith Distance is 36° 22.0′ and that the Calculated Zenith Distance is 36° 24.8′, find and name the intercept, with respect to the direction of the observed.
-2.8′.
+2.8′.
+1.5′.
-1.0′.
The true altitude of Canopus is 64° 52′.4. Find the true zenith distance.
26° 15.2′.
25° 07.6′.
24° 30.5′.
27° 00.1′.
The true zenith distance of the Sun when on the observer’s meridian bearing South is 6° 57.4′ and the declination is 14° 36′.2 S. Calculate the observer’s latitude.
8° 15.5 S.
7° 38.8 S.
6° 45.2 S.
7° 50.1 S.
To an observer in longitude 75° W, the Local Hour Angle (LHA) of the sun is 327°. What is the Greenwich Hour Angle (GHA) of the sun?
37°.
42°.
45°.
40°.
If a ship is in 30°W longitude and the equation of time is -4 minutes, what is the GMT of noon at the ship?
13 h 50 m.
13 h 56 m.
14 h 02 m.
13 h 45 m.
At the summer solstice, the altitude of the sun at noon to an observer at the pole would.
22.0 N.
23.5 N.
24.5 N.
21.0 N.
If the Azimuth of a body is found to be 305° True, the position line would be drawn through the Intercept Terminal Position in a direction of …
045°/225°.
035°/215°.
050°/230°.
040°/220°.
A position line drawn in the direction 085°/265° could correspond to an azimuth of the observed body of …
180°/360°.
175°/355°.
170°/350°.
185°/005°.
The Sun is on the observer’s meridian, declination is 16° N, Zenith distance is 6°, bearing to North. Calculate the observer’s latitude.
12° N.
10° N.
8° N.
11° N.
Sextant reading is 48° 25′.3 index error is 5′ on the arc. Find the observed altitude.
48° 30′.3.
48° 20′.3.
48° 15′.3.
48° 25′.0.
A position line drawn in the direction 150°/330° could correspond to an azimuth of the observed body of …
70°/250°.
60°/240°.
65°/245°.
75°/255°.
The summer solstice in the northern hemisphere is approximately on …
21.06.
22.06.
23.06.
20.06.
Given that the true altitude is 17° 44.0′, calculate the True Zenith Distance.
70° 30.0′.
72° 16.0′.
71° 45.0′.
73° 10.0′.
A first observation of the Sun was taken at 0815 Local Time. If the vessel is steaming at 12 knots, how far should the position line be moved along the course made good to find the position at 1200?
50 mls.
45 mls.
40 mls.
55 mls.
If a ship is in 90° E longitude and the equation of time is -4 minutes, what is the GMT of noon at the ship?
0,4 h 5,0 m.
0,5 h 5,6 m.
0,6 h 4,0 m.
0,5 h 4,5 m.
What do you call the error in the observed altitude of the sun, which results from the observer being on the surface of the earth not at its centre?
Parallax.
Refraction.
Aberration.
Atmospheric distortion.
A first observation of the Sun was taken at 0815 Local Time. If the vessel is steaming at 14 knots, how far should the position line be moved along the course made good to find the position at 1 200?
45 mls.
60 mls.
52,5 mls.
70 mls.
To an observer in longitude 65° W, the Local Hour Angle (LHA) of a star is 48°. If the Siderial Hour Angle (SHA) of the star is 217°, what is the Greenwich Hour Angle (GHA) of …
180°.
256°.
300°.
220°.
Sidereal hour angle is defined as the angular distance of an hour circle …
Zenith.
Celestrial meridian.
Equator.
Ecliptic plane.
The Sun is on the observer’s meridian, declination is 22° 19.5′ N, Zenith distance is 15° 23.6′, bearing to South. Calculate the observer’s latitude.
10° 30.4′ N.
6° 55.9′ N.
5° 45.2′ N.
8° 15.1′ N.
The earth rotates around the sun approximately every …
366.
365.
360.
364.
If the Greenwich Hour Angle (GHA) of the sun is 315° and the Local Hour Angle (LHA) is 36°, what is the longitude?
81° E.
75° E.
90° E.
70° E.
The Sun is on the observer’s meridian, declination is 4° S, zenith distance is 54°, bearing to South. Calculate the observer’s latitude.
50° N.
45° N.
52° N.
48° N.
The Sun on the observer’s meridian, declination is 4° 28′.4 S, Zenith distance is 54° 28′.6, bearing to South. Calculate the observer’s latitude.
48° 30′.5 N.
50° 00′.2 N.
52° 15′.3 N.
49° 45′.7 N.
A position line drawn in the direction 045°/225° could correspond to an azimuth of the observed body of …
135°/315°.
090°/270°.
060°/240°.
120°/300°.
When the index mirror and the horizon mirror of the sextant are parallel, the sextant should read …
05° 30′.0.
00° 00′.0.
01° 15′.0.
10° 45′.0.
Given that the True Zenith Distance is 64° 44.0′ and that the Calculated Zenith Distance is 64° 53.0′, find and name the intercept, with respect to the direction of the observed.
-5′.
+9′.
-9′.
+5′.
Sextant reading is 35° 25′.3, the index error is 2′ off the arc. Find the observed altitude?
35° 30′.3.
35° 27′.3.
35° 25′.0.
35° 26′.3.
Given that the True Zenith Distance is 17° 44.0′ and that the Calculated Zenith Distance is 17° 46.0′, find and name the intercept, with respect to the direction of the observed.
-2′.
+2′.
+1′.
-1′.
Given that the True Zenith Distance is 36° 24.8′ and that the Calculated Zenith Distance is 36° 22.0′, find and name the intercept, with respect to the direction of the observed.
-1′.5.
-2′.8.
+1′.8.
+2′.0.
Which one of the following errors of the sextant would you be unable to adjust or …
Systematic.
Instrumental.
Parallax.
Personal.
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