Jki - Air Navigation

Front 1

What is a great circle?

Back 1

Any circle drawn on the surface of a sphere such that the plane of the circle passes through its centre. It divides the sphere into two equal hemispheres.

Front 2

What is a meridian?

Back 2

A semi-great circle joining the North and South poles.

Front 3

Latitude is a ____ ____ drawn on the surface of the earth, such that it’s ____ runs ____ of the ____.

Back 3

Small circle, plane, parallel, equator.

Front 4

Illustrate the Earth, marking the axis of rotation, N and S poles, parallels of latitude, equator and meridian.

Back 4

.

Front 5

In an oblate spheroid, the ____ ____ is shorter than the ____ ____.

Back 5

minor axis, major axis

Front 6

What is the equatorial diameter of the Earth?

Back 6

6,887,086 nm. Just under 6.9 million nm.

Front 7

What is the circumference of the Earth?

Back 7

21,600 nm.

Front 8

What is a small circle?

Back 8

Any circle drawn on the surface of the sphere that does not pass through its centre. They always have smaller diameters than the sphere itself.

Front 9

The Greenwich Meridian passes through the ____ ____ in ____. What is another name for it?

Back 9

Greenwich Observatory in London. Prime Meridian.

Front 10

Longitude refers to the ____ ____ along the ____. It is the ____ distance in ___ along the equator between the prime meridian.

Back 10

angular distance, equator, shortest, arc.

Front 11

A rhumb line crosses all ____ of ____ at the same ____. Upon taking an initial bearing, direction is not changed as measured to ____ ____.

Back 11

Meridians, longitude, angle, True North.

Front 12

Illustrate longitude.

Back 12

.

Front 13

Any direction measured on a map will be a ____ direction. Due to the Earths ____ ____, a compass needle will point ____ ____, a position in ____, NE ____.

Back 13

True, magnetic field, Magnetic North, Baffinland, Canada

Front 14

The ____ pole is not fixed. In Britain, the annual north change is about _’ ____. The difference between true north and ____ ____ is known as ____.

Back 14

magnetic, 7 east, magnetic north, variation.

Front 15

Variation is the difference between the ____ ____ and the ____ ____.

Back 15

True meridian, magnetic meridian.

Front 16

When a compass is placed in an aircraft it is influenced by the Earth’s ____ ____ and ____ ____ (electrical wiring etc.) This causes the aircraft to point towards ____ North.

Back 16

Magnetic field, local magnetism, compass.

Front 17

Deviation is the difference between ____ North and ____ North.

Back 17

Magnetic, Compass.

Front 18

To convert a true heading into a compass heading, allowance must be made for both ____ and ____.

Back 18

Variation, deviation

Front 19

The rule for application of variation is East is ____ and West is ____.

Back 19

Least, best

Front 20

What shape is the Earth?

Back 20

An oblate spheroid

Front 21

The Earth rotates around it’s ____ ____.

Back 21

Minor axis

Front 22

What is the direction of the Earths rotation?

Back 22

West to East.

Front 23

How long does it take for the Earth to complete one complete revolution?

Back 23

23 hours, 56 minutes