GNAV MOCK 1

Two places on the parallel of 47ºS lie 757.8 km apart. Calculate the difference in longitude.

• 10º00'

• 4º51'

• 9º19'

• 4º39'

Kepler's second law states:

• Each planet's radius vector, sun to earth, moves at a constant angular speed

• Each planet revolves so that the radius vector, sun to earth, sweeps out equal area in equal intervals of time

• The length of the radius vector, sun to earth, is proportional to the square root of its angular speed

• The area swept out by the radius vector of each planet, sun to earth, per hour, increasing with increasing length of the radius vector

An aircraft follows a great circle in the Northern Hemisphere. At a certain moment the aircraft is in the position on the great circle where the great circle direction is 270°(T). Continuing on the great circle the

• Track angle will increase and the latitude will decrease.

• Track angle will decrease and the latitude will decrease.

• Track angle will decrease and the latitude will increase.

• Track angle will increase and the latitude will increase.

How many degrees has the mean sun moved along the celestial equator in 8 hours and 8 minutes?

• 148°

• 56°

• 122°

• 18°

The direction "Magnetic North" at a position on the earth is:

• The great circle between the position and the Magnetic North pole.

• The direction of the horizontal component of the of the earth's magnetic field at that position.

• The Compass North at that position corrected for variation.

• The isogonal to the Magnetic North pole.

Assuming mid-latitudes (40° to 50°N/S). At which time of year is the relationship between the length of day and night, as well as the rate of change of declination of the sun, changing at the greatest rate?

• Summer solstice and winter solstice

• Summer solstice and spring equinox

• Spring equinox and autumn equinox

• Winter solstice and autumn equinox

In order to fly from position A (10°00'N, 030°00'W) to position B (30°00'N, 050°00'W), maintaining a constant True Course, it is necessary to fly:

• A Rhumb Line Track

• The constant average drift route

• The great-circle route

• A straight line plotted on a Lambert chart

Which statement is true?

• Only the declination of the sun will affect the duration of civil twilight.

• Civil twilight at the equator lasts longer than at 60°N or 60°S because the radius of the equator is larger than the radius of the 60°parallel.

• The declination of the sun and the latitude of the observer will affect the duration of civil twilight.

• The duration of the civil twilight on 21st of March and on 23rd of September is equal at all places on Earth independent of latitude.

Which of these statements best defines the term " True North"?

• The direction along the surface of the earth towards the geographic North Pole along the meridian on which you are located

• The heading of the aircraft at the time

• The direction related to Polaris, the North Star

• The datum from which the aircraft heading is measured

Which definition of the equator is correct?

• The equator is a small circle, the plane is parallel to the earth rotational axis.

• The equator is a great circle with its plane parallel to the earth rotational axis.

• The equator is a great circle with its plane perpendicular to the earth rotational axis.

• The equator is a small circle with its plane perpendicular to the earth rotational axis.