061.01 Basics of Navigation

Question 1

At 0000 LMT of an observer the (mean/apparent) Sun is in transit with the observer’s (meridian/anti-meridian)​.

Answer 1

At 0000 LMT of an observer the (mean) Sun is in transit with the observer’s (anti-meridian).

Question 2

The maximum difference between geocentric and geodetic latitude occurs at about (…)​.

Answer 2

The maximum difference between geocentric and geodetic latitude occurs at about (45°N/S).

Question 3

Astronomical twilight is when the sun is (…)°​ below the horizon.

Answer 3

Astronomical twilight is when the sun is (18)° below the horizon.

Question 4

The right visualisation of latitude in the appendix is (Geocentric/Geographic or Geodetic)​ latitude.

Answer 4

The right visualisation of latitude in the appendix is (Geographic or Geodetic) latitude.

Question 5

The term Aphelion is the point of the Earth’s orbit (closest/furthest away from) to the sun. The approximate date is (…). At this point the Earth in its orbit reaches the (highest/lowest) speed.

Answer 5

The term Aphelion is the point of the Earth’s orbit (furthest away from) to the sun. The approximate date is (beginning of July)​. At this point the Earth in its orbit reaches the (lowest)​ speed.

Question 6

Nautical twilight is when the sun is (…)°​ below the horizon.

Answer 6

Nautical twilight is when the sun is (12)° below the horizon.

Question 7

Lines on a map or charts joining positions with equal magnetic dip are termed (…)​.

Answer 7

Lines on a map or charts joining positions with equal magnetic dip are termed (isoclinals).

Question 8

A orthodrome is a (…).

Answer 8

A orthodrome is a (great circle)​.

Question 9

The magnetic North Pole seems to rotate around the geographical North Pole at a rate of movement of 1° in (1/5/9/11) ​years.

Answer 9

The magnetic North Pole seems to rotate around the geographical North Pole at a rate of movement of 1° in (5) years.

Question 10

State Kepler’s 1^st Law

Answer 10

Planets move in elliptic orbits with the sun in one of the foci.

Question 11

The angle between the plane of the Ecliptic and the plane of Equator is approximately (…)°​.

Answer 11

The angle between the plane of the Ecliptic and the plane of Equator is approximately (23.5)°.

Question 12

State Kepler’s 2^nd Law

Answer 12

The radius vector sun-earth sweeps out equal areas in equal time.

Question 13

The mean Sun is a (visible/fictitious) Sun and the lenght of a day (is constant/varies) throughout the year.

Answer 13

The mean Sun is a (fictitious) Sun and the lenght of a day (is constant) throughout the year.

Question 14

The relationship between the lenght of day and night, as well as the rate of change of declination of the Sun, changing at the greatest rate is at the (winter and summer solstice/spring and autumn equinox)​.

Answer 14

The relationship between the lenght of day and night, as well as the rate of change of declination of the Sun, changing at the greatest rate is at the (spring and autumn equinox).

Question 15

On the Earth’s ellipsoid, one degree of latitude near the poles is (more/less) ​than 60 NM.

Answer 15

On the Earth’s ellipsoid, one degree of latitude near the poles is (more) than 60 NM.

Question 16

A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an (…)​.

Answer 16

A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an (agonic line).

Question 17

Time given for sunrise, sunset, morning - and evening twilight in the Air Almanac is given in (ST/LMT/UTC)​.

Answer 17

Time given for sunrise, sunset, morning - and evening twilight in the Air Almanac is given in (LMT).

Question 18

Latitude of the Tropic of Capricorn is (…)​.

Answer 18

Latitude of the Tropic of Capricorn is (23.5°S).

Question 19

At the Equinoxes, the Sun’s declination is (…)°​.

Answer 19

At the Equinoxes, the Sun’s declination is (0)°.

Question 20

In its path around the Sun, the axis of the Earth has an inclination of (…)°​ with the plane of the path.

Answer 20

In its path around the Sun, the axis of the Earth has an inclination of (66.5)° with the plane of the path.

Question 21

The term Perihelion is the point of the Earth’s orbit (closest/furthest away from) to the sun. The approximate date is (…)​. At this point the Earth in its orbit reaches the (highest/lowest)​ speed.

Answer 21

The term Perihelion is the point of the Earth’s orbit (closest) to the sun. The approximate date is (beginning of January)​. At this point the Earth in its orbit reaches the (highest)​ speed.

Question 22

Close to the (solstices/equinoxes) the influence of latitude on the duration of daylight is at its smallest.

Answer 22

Close to the (equinoxes) the influence of latitude on the duration of daylight is at its smallest.

Question 23

The left visualisation of latitude in the appendix is (Geocentric/Geographic or Geodetic)​ latitude.

Answer 23

The left visualisation of latitude in the appendix is (Geocentric) latitude.

Question 24

In a simple magnet, the field’s direction is from the magnet’s (red/blue) pole to the magnet’s (red/blue) ​pole.

Answer 24

In a simple magnet, the field’s direction is from the magnet’s (red) pole to the magnet’s (blue) pole.

Question 25

The maximum value of magnetic variation is (…)​°.

Answer 25

The maximum value of magnetic variation is (180)°.

Question 26

The latitude of the polar circles is (…).

Answer 26

The latitude of the polar circles is (66.5°N/S).

Question 27

State Kepler’s 3^rd Law

Answer 27

The square of the period of the orbit of a planet is proportional to the cube of that planet’s semi major axis. The constant of proportionality is the same for all planets.

Question 28

Civil twilight is when the sun is (…)°​ below the horizon.

Answer 28

Civil twilight is when the sun is (6)° below the horizon.

Question 29

On the Earth’s ellipsoid, one degree of latitude near the equator is (more/less) ​than 60 NM.

Answer 29

On the Earth’s ellipsoid, one degree of latitude near the equator is (less) than 60 NM.

Question 30

The diameter of the Earth is approximately (…) km.

Answer 30

The diameter of the Earth is approximately (12700) km.

Question 31

The difference between the transit of the apparent Sun and mean Sun across the Greenwhich Meridian is the greatest in (…) and (…)​. (months)

Answer 31

The difference between the transit of the apparent Sun and mean Sun across the Greenwhich Meridian is the greatest in (February) and (November).

Question 32

Define a sidereal day.

Answer 32

A sidereal day is the time interval between two successive transits of a celestial body of the same meridian. The duration of a sidereal day is constant at 23h 56min and 4.1s.

Question 33

The Sun’s declination is the Sun’s position (…)​.

Answer 33

The Sun’s declination is the Sun’s position (relative to the plane of the Equator).

- The angular distance of the sun north or south of the Celestial equator -

Question 34

Latitude of the Tropic of Cancer is (…)​.

Answer 34

Latitude of the Tropic of Cancer is (23.5°N).

Question 35

At the Solstices, the Sun’s declination is (…)°​.

Answer 35

At the Solstices, the Sun’s declination is (23.5)°.

Question 36

The apparent Sun is a (visible/fictitious) Sun and the lenght of a day (is constant/varies) throughout the year.

Answer 36

The apparent Sun is a (visible) Sun and the lenght of a day (varies) throughout the year.

Question 37

Lines on a map or charts joining positions with equal magnetic variation are termed (…)​.

Answer 37

Lines on a map or charts joining positions with equal magnetic variation are termed (isogonals).